I think we'll see something around $54 million guaranteed, with incentives that could get him to $62 million, probably based on 3-point shooting and all-defense honors.
Am I missing something, or are you combining Grant and Robert Williams here?
Where's Grant in the rotation? He was 5th in the playoffs for mpg, but 7th during the regular season. Brogdon pushes him further down the list, but Al's age and any Time Lord injuries will move him back up.
How many playoff teams are paying full non-tax payer mid-level money to their 7-8th man? (Perhaps the Celtics already if you think Grant is better than White, ha).
I'm not sure what you're missing with the bolded. I think incentives for Grant will be based on defense and 3-point shooting, as those are the most valuable elements he brings to the team that you want him to maintain. Rob has all-defense and games played, because defense is obviously important and availability has been a problem. I didn't mix them up.
MLE or above isn't crazy for a spot starter or 6th-7th man. The Clippers go 9 deep with MLE+ contracts, so I have plenty to draw from there. The Raptors just resigned Boucher for 3 years, $35 million for reserve role. The Suns gave Shamet about 97% of the projected MLE when they gave him his extension. The Bucks just resigned Bobby Portis to an MLE+ deal, coming off a postseason where he averaged 3 fewer minutes per game than Grant. Sure, there are some more top-heavy teams like the Nets, or teams with a bunch of guys on rookie contracts like the Grizzlies, but it's not extravagant. Just last year the Celtics traded for Derrick White, who makes far above the MLE, for a reserve role, and this summer added Brogdan, who makes more still, for a reserve role.