The reason why Hot Prospects can be attractive, the $$ value is good, and often their numbers have already been adjusted.

When players are generated the attributes Defense, Attack, and Physical are all pretty much the same, with a couple points more on their primary skill. Some perform quite well, but many need more training and applying points before you get the best out of them. And the kicker is five star and Scouts train slowest so if they don't perform it can take longer since they train slower.