"Silver is incompetent" is funny and all, but it's overused at this point. "Silver is actually hyper competent but with no sense of scale" is infinitely better.
Canon example: he has a mission to kill the Iblis Trigger and save the world, but a random girl needs help finding her crush? Yeah, that seems just as deserving of his undivided attention. He can multitask.
Imagine the comedic potential. He goes to the post office to pick up mail and ends up delivering everyone else's mail because it's a busy day and he can fly, why shouldn't he spend the next five hours on this??
Better yet, he's fighting a giant robot and gets a phone call. Obviously he has to answer it, and it's something really trivial like "hey Silver we're out of milk, could you pick some up on your way back" and immediately Silver's like "oh crap!! You're right!! We are out of milk!! But the store closes at 8:00!!! IT'S 7:30!!!"
So he just decks the robot in the face with a pillar, makes the quickest transaction that store has ever seen (accidentally paying like $20 for it), and goes right back to the fight with the milk suspended in midair. He pulls zero punches as Silver tends to and goes home wondering where his $20 went.