The secret technique to counter regeneration is to infuse your own Haki into your opponent, and by infusing his Haki into Sommers, Gaban stopped his regen temporally.
This is the technique Gaban will teach the SH.
If this is not the case, then Sommers is done and will underhype the God's Knight massively.
This is the technique Gaban will teach the SH.
If this is not the case, then Sommers is done and will underhype the God's Knight massively.