Yeah, I agree. Actually yesterday I just trained one of my wingers to 7 stars and the ST to 7 stars, and today the winger performed the important role although the ST did not.
Another interesting thing is that if my team + Beckstar's team we might be able to make 10:0 to an opponent like his or mine, because all the positions for his low rated players are good ratings on my end and vice versa. This is amazing!