I was thinking this too last night. The fact we don't know anything about Luffys mother and Dragons mother too is extremely suspicious and concerning too.
Oda is going to have to keep working into extreme overtime to keep trying to defend Garps character. But some of it does makes sense including this possibility ofc but his personality even to this day contradicts it imo.
It's the only explanation I've seen, and it totally fits the WG/CDs.
I've said for a long time I think Imu is an even worse version of Big Mom, and that Totto Land is a microcosm of the WG: a "united" entity, ruled by different powerful people from one family, where everyone is constantly stealing from others to give one psychopath everything they want, to keep them from destroying everything.
Linlin would take your life if you left her crew.
If you leave the World Government? They take everything they can.
Garp knowing saving Ace would destroy Goa Kingdom would make the Dadan scene where she beats up Garp HEARTBREAKING to reread in context.
Fuck Goa Kingdom, just get the Bandits out, and burn it all down, fuck, Ace is worth it