I think the time stop thing is still a very debatable subject. You can debate and say that Hiro never showed other top tier characters to be affected by it, fine, but he also never showed that they werent. So your basically left with your own theories how the time stop stuff works to beign with. I believe that time does not have range, cuz if it had range than what Dimaria is manipulating is perception like Racer (basically a super maxed out slow magic) or straight up creating a pocket dimension that is outside time (which can be the case, but we never got any statement that would imply that).
In my own headcanon Dimaria manipulates time itself (like she stated in the manga), and her magic has no range cuz time does not have range. To God, time is a physical object that can be manipulated cuz God is outside time (this is some college level philosophy

), so it would be pretty logical Dimaria can do that since she is the vessel of the very god of time right (Dimaria states that she is alone in the world, key word is "world"). Thats why i think only characters that are the very counter to time stop or have magic power superior to a god can bypass it. I think neither Laxus or Jellal could beat Dimaria. Sure they are greater fighters than her, but they dont have the magic power to bypass the time stop (Gildarts is tricky cuz it was never stated how high his magic power was, but i was always under the impression that it was on the same level as Makarov, so question is was it on the same level or even higher after the time skip). The one thing i am sure is that the spriggans have the highest magic power in the verse (not counting dragons and Fairy Heart, or other deities if there ever were ones). As fighters most of them are trash, but MPwise they are still on a different tier.
Also i think Alvarez arc and the Spriggan 12 fights in general were more about who can counter who. Thats why its pretty hard to gauge were they stand with the top tier of FT guild fighters or globally for that matter. One time there is a spriggan who can demolish a top tier character, but other time the very same spriggan straight up loses like trash against a weaker character cuz that character they are fighting is their very counter.
Just my thoughts about how i see things