I don't see how that's makes Gaban better than Ray. But I suppose some people need to make their own happiness since Oda clearly isn't providing it to them
The whole ZvS skirmish in old era clothes has grown stale by now.
Having said that, I can see people weave an argument out of the fact that Gaban, Shanks, and Loki are being equated with Roger and Garp in taking down what is basically the same character, powerlevel-wise, Xebec/Harald.
Sure Ray has been said to be Gaban's peer, but on panel Ray hasn't done anything, while Gaban is necessary to take down the king of giants.
Some fans only see fights as mathematical elements for their power scaling agendas.
If DR Xebec = DR Harald
and if GV Roger = GV Garp
and if Roger + Garp = Xebec
now that we get Shanks + Gaban + Loki = Harald
depending on each of the three's output, we could say that
Flashback Shanks/Flashback Gaban/Flashback Loki = 1/3 Roger+Garp