^kuroro is around zeno's level. read york shin. kuroro asks zeno who will win between them in a fight, zeno said "of course i will. but it will be a different story if you were tying to kill me."
in any case, meruem would rape, sadly. the ryodan might have 40% chance with the old mereum, but not against this regenerated, overpowered new one
Of course we could just interpret this as the old "Grandpa Humility" effect. We've seen this with Netero, who lowered himself to Novu and Morau's level. When it's clearly not the case. My opinion on Kuroro's strength is that he's below Zeno but he's somewhat near, only because of the mysterious contents of his Skill Hunter.
Kuroro - Skill Hunter + the skills inside it
Feitan - Pain Packer
Uvo (yes I'm gonna include him) - Big Bang Impact
Franklin - Double Machine Gun
Phinks - Ripper Cyclotron
Bonorenolf - Le Batte Cantabile
Shizuku - Demechan
Shalnark - Black Voice
Nobunaga - unnamed En "instant" reaction attack
Pakunoda - Memory Bullets
Kurotopi - Right Hand of Devil, Left Hand of God
Karuto - The paper manipulation technique
VS.
Meryem 2 (the current Meryem)
Doesn't look good for the Ryodan.
To damage Meryem one must surpass the damage input of Hyakushiki Zero multiple times.
Of all the Hatsus from the Ryodan we've seen so far, maybe Ripper Cyclotron would do the trick, only if it give Phinks infinite power after infinite swings. But that's unlikely. Phinks might die immediately before he gets an arm swing off (Kamehameha in the face?).
If Indoor Fish ignores all defense then Meryem is in trouble. Then again, it's too easy for Meryem to just whiz past that and get to Kuroro's neck. Of course, there might be a lot of other deadly Hatsus Kuroro might have in his book, but I won't count on them for now.
Or, of course, Kurotopi can cheat and copy tons of freaking Roses.
There's also the issue of speed. How do you heck do you handle something like Instant Transmission? Who in the Ryodan can handle that? Speculation aside, nobody. Because Kuroro couldn't even get past Zeno, and Feitan couldn't even completely avoid damage with his speed in his fight against Zazan.
We all know what Meryem is capable of, damage-wise. He can OHKO decently-leveled beings like Knuckle and blasts mountains with ease.
So I can understand why Togashi didn't have the entire Ryodan (with a possibly rehabilitated Kuroro) fight Meryem 2. Because he doesn't want them to die and give them more appearances in the future for the fanboys and girls. But yeah, I forgot about plot armor for a second, so...
Doesn't look good for the Ryodan at all.