Garp, bootlicker as he is, preferred hanging out with his boss rather than being out chasing pirates. He only went out when it was his desired (friend) pirates, such as Roger, shiki, chinjao and such. So he can fight non lethal battles and have fun.
The Chad admiral that actually had the balls to stand his ground against mihawk lays 6 foot deep in his grave now and waits for the mihawk flashback to get introduced.
and Fujitora will join him soon