Skal and Willie in the staring will pretty much help us tank, no rebound and no rim protection at all.
Here's one of the problems with wanting a rim protector. or at least having a player that puts up rim protecting stats. The NBA has changed. The traditional center has gone out of vogue. Now you have to deal with the Cousins, Anthony Davis, Karl Anthony Towns type of center. A center that pulls you away from the basket, thereby opening up the lane and making if more difficult to be in a position to block a shot. I'm not saying it's impossible, but it is more difficult to put up the same stats as previously.
There are currently 24 players in the league with 1 block per game or more, and at least half of them aren't centers. Willie has flirted with being in that group off and on all season. He currently sits at 0.9 blocks per game. Someone in one of the posts, and I'm paraphrasing, said that an NBA center should average at least 10 rebounds a game. Really? Currently, there are only 11 players in the league averaging more than 10 rebounds a game, and not all of them are centers. There's perception, and then there's reality. I tend to be a realist, because perceptions tend to disappoint me.
I took a trip around the league to check out the rebounding averages for each teams center. A few of the teams have center by committee which is noted.
Hawks: Plumlee - 3.8 rpg, John Collins - 7.0 rpg
Celtics: Baynes - 5.3 rpg, Horford - 7.7 rpg
Net's: Jarrett Allen - 5.1 rpg, Okafor - 3.1 rpg
Hornets: Dwight Howard - 12.6 rpg
Bulls: Robin Lopez - 5.5 rpg
Cav's: Thompson - 6.0 rpg
Pistons: Drummond - 15.7 rpg
Pacers: Myles Turner - 6.6 rpg
Heat: Whiteside - 11.9 rpg
Bucks: Henson - 6.9 rpg
Knicks: Kanter - 10.7 rpg
Magic: Vucevic - 9.3 rpg
76er's: Embiid - 11.1 rpg
Raptors: Valanciunas - 8.4 rpg
Wizards: Gortat - 8.0 rpg
Mavericks: Powell - 5.2 rpg
Nuggets: Jokic - 10.6 rpg
Warriors: Pachulia - 4.9 rpg, Bell - 3.9 rpg
Rockets: Capela - 11.1 rpg
Clippers: Jordan - 15.0 rpg
Lakers: Brook Lopez - 3.8 rpg
Grizzleys: Gasol - 8.4 rpg
Timberwolves: Towns - 12.2 rpg
Pelicans: Cousins - 12.9 rpg
Thunder: Adams - 9.1 rpg
Sun's: Chandler - 9.5 rpg
TrailBlazers: Nurkic - 8.2 rpg
Spurs: Aldridge - 8.4 rpg
Jazz: Gobert - 10.1 rpg
Kings: Cauley-Stein - 6.7 rpg
This isn't to show that Willie is good, bad, or otherwise. Just a reference against the rest of the league. A few of the top rebounders, like Howard or Chandler for instance, are fairly one dimensional players at this stage of their careers. Other's like Kanter, are not very good defensive players. Point is that most of the players listed are flawed in some way. The one's that aren't, at least significantly, are players like Cousins, Anthony, Towns, etc. They're the elite players in the league.