Based on what we know, abnormally quick recovery is the only benefit Zoans get from awakening—that makes them highly resilient by extension though. Also, zoans don't regenerate. That's a big misconception about the Zoan fruits; they just recover quickly which is infinitely inferior to what regeneration can do. Zoan awakening, or awakening in general, is not half as OP as you think it is. It certainly is not an ability that Oda would reserved only for top-tiers. It makes perfect sense for King, Marco, and even Queen to have awakening.
Yes Awakenings are overrated but still jailers from Impel Down wake up faster than we have ever seen before. You have to beat user so badly that he wont recover.
Well i dont think they have Awakenings but i guess we have to Wait until end of the arc to see if they have it.