1. GB doesn’t have the gracefulness to finesse SHs like Gunko did. He would accidentally kill the children like a brute
2. Suddenly we are giving Naruto feats to a OP character that’s the level of desperation we have reached

3. GB doesn’t grow thorny branches. He can’t pit invisible thorns onto children either. He can’t do what Sommers did to kids
4. GB also can’t fuse with Adam tree. We didnt see Kizaru fuse with Vegapunk light barriers
His weakness of fire and lightning also makes him prime target for Loki to stomp
Basically GB lacks the finesse and proper match-up to be a true threat in Elbaf. He would be immediately detected, he can’t kidnap children, the whole point is to subjugate not conquer. And Loki would 100% beat him given his weakness. We still haven’t seen the extent of HKs nor the key to beating their regen hax