I just went through all of the collection sets, and I understand some of the questionable choices, but not all of them.
EA_Aljo Here are some more thoughts and questions about the collection sets:
Gretzky: Why is Gretzky's MSP a Blues card when his collection set highlights his trade from the Oilers to the Kings? And why are two of the players with the teams they were traded from while the other players are with the team they were traded to? And what is going on with Jimmy Carson's card? I mean a part of his head is behind the box on the top left corner. Why couldn't the picture be moved a bit to the right? It seems very lazy. There is a similar issue with Duane Sutter's Superstar Origins card as well.
Karlsson: Both DeMelo and Stutzle already had a higher overall card. Why didn't you use Rudolfs Balcers in this set instead of one of those two players? And why didn't you pick someone else instead of DeMelo for the game Breakers card? Or why didn't you use someone who played in the Sharks with Karlsson? Now you used 4 players who were involved in the trade, which makes sense in itself, but the problem is that 2 of those 4 players already had a higher overall card. And 2 of 4 those players got a Sharks card even though all 4 players were traded from the Sharks to the Senators.
Iginla: I understand that there weren't many options from the Penguins besides Malkin, but how about for example Chris Kunitz, Brooks Orpik or Tyler Kennedy? And why on earth is Joe Nieuwendyk in this set? It doesn't make any sense to me. I mean he didn't even play for the Flames at the same time with Iginla, and he was retired when Iginla was traded to the Penguins. I'm pretty sure there would have been better options. For example Theoren Fleury and Matt Stajan played for the Flames at the same time with Iginla and don't have any cards other than their base alumni cards. And why did Nieuwendyk get a Stars card when Iginla never played for the Stars? At least Nieuwendyk only had a HUT Champs card before the Trade Quest event, so I'm not complaining about the fact that he got a new card, but I think this was a very strange way to give him a card.
Pronger: This set seems to highlight two different trades in Pronger's career instead of just one trade like the other sets, but all of the choices make sense to me.
Roy: Again, why did the traded players get a card with the team they were traded from instead of the team they were traded to? Otherwise nothing to say about this set.
Hamilton: Fox already had a 91 overall card, and Hanifin already had an 89 overall card. Why didn't you pick some other players instead of those two in the earlier events? And why did Hanifin not get a 91 overall card? Why did Lauzon get a 91 when his previous highest overall card was an 86 while Hanifin got an 89 when he already had an 89? How does that make any sense? Lindholm also has a Superstar Origins card, but at least it's an 89 while his Trade Quest card is an 89. And Fox didn't have to be used in this set at all. I know he was involved in Hamilton's trade to the Hurricanes, but that was before his NHL career and he has never played for any of the teams that Hamilton has played for. You could surely have used someone who was Hamilton's teammate at some point instead of Fox. There would have been many options.
As you can see, there are many things that could have been done differently with those sets to make them better while keeping the 89 and 91 overalls.
Edit: I know now why Nieuwendyk got a card and why it is a Stars card so you don't need to explain that. I didn't realize at first that it's a similar situation to Fox and that Iginla's set also highlights two different trades.