That's because --as Olshey said in the article-- its the harsh truth. Achilles are NOT something to mess with. 28 might not be old, but you can't realistically think he will be 100% healthy for this entire season. He'll be 29 in october. So, given this is a "recuperating" year for him, he is 30 at the beginning of next season making 18 million. 30 is when you're realistically going to get him back, 100% healthy (however healthy 100% is after achilles surgery). He was already limited in creating his own shot. Sure, he can post up...but lets see him blow by someone off the dribble, lets see him crossover, spin move, stepback jumper. ANYTHING without him being in a set position. If he has to dribble - he is limited. That's just the fact of the matter & thats a big limitation for a SG (which was covered up by Batum being a great passer and ballhander for a SF).
I don't think paying 18 mill for a SG that you'd realistically have healthy at age 30, with this group of players, is even comparable to playing a 23 year old center who is on offensive force and solid rebounder. Additionally, you don't know how the achilles will affect Wes' defense. Love the dude, but as with all players, he has his limitations - and its a lot easier to find a middle aged SG than it is to find a 7' offensive beast. That's all my point was.