I don't remember Flash ever being confirmed to be just about superspeed. The wiki claims that is the case, but the citations they have don't actually refer to chapters where anything like that was stated, only to instances of Lucodiel moving really fast. I always assumed Flash was about the control of light because all the other Graces were elemental magic. If Ocean's control of water allows the user to somehow liquify their own body, then it stands to reason that Flash's control of light could enable the user to briefly move their body at the speed of light, which makes it look like he's teleporting. I think my interpretation is strongly supported by chapter 286 where Ludociel boasts about the might of his Flash while using a kind of star shaped attack similar to Ironside's magic. The wiki states that this was actually an Ark attack combined with Flash, but this doesn't seem to be based on anything. I guess you could argue that the sparkles that manifest together with the attack are similar to the sparkles you see with Ark, but Ludociel also used another spell in chapter 288 which just produced a very bright light with no sparkles or anything else. Flash being light magic seems to explain every detail of Ludociel's abilities and fits the overall theme of the Graces.
I'm tempted to bring this argument forth on the wiki to see if they would reconsider some of their claims but I'm too lazy to make an account to address something that's not really all that important. I'd wager some wiki users probably browse these forums anyway so if I'm lucky someone particularly dedicated might do my work for me at some point.
I wasn't basing it off of the wiki, just my own reading. Alot of Lucodiel's actions are tried with speed, thus my conclusion. It's true nothing as such was ever stated, so I could be wrong in that regard. Perhaps it's due to the idea that sunlight and light seem redundant, but your point stands.
The boat does look like it could be related to the goddesses, although I'm not really sure why they would need a flying boat if they can already fly. Even the figurehead or whatever you call the thing at the front kind of looks like a dragon, which were portrayed in the gate to the goddess realm seen in the holy war flashback. Nakaba might have abandoned the goddess-dragon connection later on though since apparently Chaos has some sort of a connection to dragons or at least to one really prominent dragon. I could definitely see Ironside having some kind of involvement with the goddesses, but I don't think he's actually a goddess himself since Percival is apparently a human rather than some sort of a hybrid. Bringing back the druids would be neat, but it might create some overlap between Ironside and Hendy as antagonists. We have already seen instances of goddesses possessing humans before so that could always be a thing as well.
Now that I think about it, this idea that Ironside is working for the goddesses would actually be a very fitting plot twist. He's trying to seal the demons away just like what the goddesses already did in the past, but instead of sacrificing goddesses to do it he's using humans. Or maybe activating the CoED would actually help the goddesses get their bodies back somehow since that's what originally cost them their bodies in the first place. The whole thing with Ironside and the rest of Arthur's knights pushing human supremacy could be an attempt to make the other clans hate humans. This is very similar to what the goddesses did in the Holy War where they managed to convince all the other clans to ally against the demons. The demon clan was the strongest so the goddesses tried to use all the other clans to defeat them and now that humans are in charge the goddesses are trying to do the same thing to them. Perhaps this was the SD's master plan all along; manipulate the other clans to take each other out one by one until hers is the only one remaining. If she survives the movie then I'd say this is definitely a possibility. I'm not sure if people would like the parallels though. NNT's first arc was about a demon manipulating a kingdom of holy knights and the first arc of the sequel would be about the goddesses manipulating a kingdom of holy knights. I'm sure many people would call it repetitive no matter how well it was executed.
I assume it was more that Ironside himself was the one to make the boat via his magic, since he can't fly. I agree that Ironside is likely not a goddess himself, but has some connection with them. Would explain his usage of the Coffin. I don't think there will be any overlap, because Hendrickson really didn't use any of his druid/goddess abilities while he was a villain, at least outside of reviving people I believe.
That would be a cool twist, and the way to bring us more information about the goddesses. We already know they aren't exactly against killing the innocent or sacrificing their pawns. It would also explain the likes of Mael missing, and the antagonize towards Liones. The only issue is how this would connect to Arthur and Camelot, though I suppose they could in turn be being used by Chaos.
In Ironside's case it isn't enough to say it's anyway goddess related, unless we're confirmed later
It's a theory based on the fact that so far we haven't seen such connected to anyone but the goddesses. Add in the fact that Ironside's magic remains unnamed while his fellow knights had their magic imminently revealed with their introductions, would suggest there's something up with it then it just being his magic.
Actually, the triskelion was the symbol the goddesses used more than the crosses.
Meant when they fought or use their techniques.