So then what do you suggest?  Narrowing the attack box on skyfall, making the follow up more startup, increasing the move’s active frames to make it more reactable, removing flipout on knee, removing ground bounce on skyfall, or plain removing the skyfall?  I can’t deny the move has a GIANT hitbox, but I also think it has one rightfully so.  If it’s too narrow it becomes useless because gauging distances to actually use it correctly would become ridiculously hard, and missing with it when it should have hit would become far too frequent, the other extreme opposite of where we are currently.
If you remove dropkick, his ability to gain distance on fast moving, distance oriented characters is hindered, and with zoners being stronger than ever, Thunder would be useless against half the cast.  If you could remove the flipout on knee…actually while that would remove some of his mixup potential, I could see it removing loop options as far as that goes, but the flipout loops for damage is the big thing everyone wants eliminated right?  There would have to be an offset to the knee losing flipout though, maybe just acting as a juggle?
Thunder’s a character that has the most to risk with the removal of any tool in his arsenal, and to be honest, the only conclusion I can come to is people want the weaker season 2 version of him back, where he has insane amounts of trouble getting in, no juggle potential, and overall suffers against characters with extreme zoning potential because he can’t even get in to do what he has to, rendering him unplayable.  His balance is probably one of the toughest ones in the cast to achieve, and every season he’s probably been the problem character to correctly balance in a game built on the craziness KI has become.  I can easily say, I don’t want him back to season 2 levels, it’s game over if you do that to him, and I have to voice out against that.
Yeah, but with a newfound emphasis on combos other than the grounded game ones, isn’t giving him better potential for a shadow cashout a reasonable decision?  I don’t see the light sammamish being invincible being a problem, and giving Thunder opportunity to cashout a juggle isn’t so bad.  Of course, you could be referring to the fact he also has follow up on shadow sammamish with skyfall and knee flipout.
So he should just be useless against zoner’s and never be able to gain ground?  I understand making distance matchups difficult, but that would just be the end for the character.  Thunder would pretty much be the only unusable character in the game.  And if you honestly feel that way, maybe Maya shouldn’t have dagger follow ups on her DP either?  Her’s are worse than Thunder’s, making her completely safe on block.