Don look at the skills, look at the stats.

U wanna know if is a "key player" or whatever what thing he is? do a friendly vs a 1* team to oversize the internal proggramming, so in this case you will see how determinant he can be in a fast way.

9 stars don't matter if a ST is proggrammed to have a Max. of ratio scoing of 1 goal per 10 matches when some players the ratio with 5 stars is 12 goals in 10 matches. Remember, internal proggramming. The other thing are just stars.