OK thanks. That makes sense. I have been basically filling my deck, then combining all my pros, then using the pros to train my super rares.
So trained up cards are worth more XP when training another card? That's good to know...my impression was that the prior training would essentially be lost.
Also there is now a sub-reddit for this game. Some good info/discussion there
https://m.reddit.com/r/NHLSuperCard/