The problem with O-Tama's power is that it's super convenient and that it's sucking the tention out of this raid like this raid needs any more less tention than it already is.
The gifter army was built up to be something major since Punk Hazard and it's even in Kaido's epithet of hundred beats for god's sake but no let's make it something that's super easy barely an inconvenience for the alliance thanks to the Tama moshi or whatever balls trash plot device that Oda came up with.