This year's team definitely lacked secondary scoring, besides a very solid top 5 forwards (Keller, Harper, JFK, Carpenter, Greenway) they only had 4 that could score at a rate acceptable for a 3rd line forward in HE (Bellows, Roberto, Olsson, and Curry). So once Olsson was out BU essentially had a 3rd line forward on the 2nd line, and the two remaining 3rd line forwards with a 4th line forward on the 3rd line.
Replacing JFK and Keller (and possibly Greenway) with Tkachuk and Bowers is definitely a downgrade of the top group, but losing Roberto and adding Crone, Cockerill, and Amonte should upgrade the secondary scoring. It'll be hard to know if this is a net positive or negative until they start playing hockey.