Funny, this was you back in January before the trade:
"If its a deal with the Leafs. It would take something like Kapanen or Sandlin, Liljegren would be my 3rd choice plus the 1st for Muzzin. Otherwise the Kings can look at other offers they may be better."
"But you may be one that is fantasizing a B prospect is getting Muzzin when quality D men are scarce and in high demand at the TDL."
"Kings need to up their speed in their fwd group. I can see them insisting on Kapanen + the 1st for Muzzin."
So you were confident it would have to be one of the Leafs best prospects or young players, in one of Kapanen, Sandin or Liljegren because Muzzin is a solid top pairing guy that the Leafs desperately needed. You also said this in the same thread:
"I repeat this was for a impending UFA. Muzzin is signed for next season at a cap friendly number, and he is also a #1 pairing at worst top #2 pairing guy on a contender. "
You have since backpedaled:
"The thing I never realized is just how slow Muzzin can be. Yeah, you nailed it. When the trade happened, some people were quick to chest pump."
And this was called out by a Leafs fan (Liferleafer) before the trade even went down:
"Calling it right now....if the Leafs trade for Muzzin, you will be in the thread saying 2 things:
1. No matter what we trade for him, you will say we lost the trade.
2. The minute the deal is done, you will be calling Muzzin a terrible addition and nothing more than a #4 defender."
So, in summary, you were more than confident that the Kings would demand someone like Kapanen because the Leafs were desperate and Dubas would get backed into a corner. You were not thinking of Grundstrom as a suitable option at all, yet now he's amazing and Muzzin is slow and no good, and Leafs fans were too quick to pump their chest and be happy about the trade. Nothing new.