I guess the only way to stop this is to actually register those players in a team that is in ML before you start the ML. This way they wont be 'reborn' and have an overall of 88 on a the age of 16. Konami did something stupid tho, they actually take the stats of the player as he is lets say 35 years old. Most of these players have lost their speed.
Then they make em 16-19 years old and just reduce all of their stats by lets say 10 (So 83 Dribbling Accuracy will become 73). Stupid Konami has greatly reduced the speed of which the speed-attributes will grow for Pes 2011.
So i end up with Henry having like 79 top speed at his peak after being reborn. I mean he would've had like 90 top speed at his peak in reallife!