I added Timashov, because in my trade both Comtois, and Ritchie are LW, so there is a loss of two LW.... you've got Johnsson, and Timashov coming in as replacements.
Comparing when players enter the league, across various teams can be difficult. When you've got teams that are very deep in certain positions, and value overseasoning in the minors, it's going to take players longer to make the NHL. The age when they enter the NHL, shouldn't determine their value. Right now, the Leafs prefer to keep players in the AHL, to maximize their learning. I'm not going to trying and sell the idea that Timashov is an incredible prospect, but I think under the right circumstances, he's a 30ish point guy, third line energy winger. The addition was to balance out LW out, with LW in.
Ceci has actually been decent with the Leafs, not great, but better than expected. I've included him, as the Ducks are in need of RHD. In reality, there is little chance that they move Manson, but even for fantasy purposes, there is no chance that they move him, without a RHD coming back. Earlier I might have included Barrie in the equation, but frankly he's been great since the coaching change, PPG and been our best D (at least offensively) IMO, Barrie's value with an extension, would exceed that of Manson's.