Rafa is/has destroyed Ryan Babel, and has already destroyed Robbie Keane, Fernando Morientes etc.
No he hasn't, you twit. It's impossible to just completely change a player's level of ability like that. Maybe just the team or the position they are played in doesn't suit them.
There are exceptional cases such as Brazilian Ronaldo putting on a ton of weight, and consequently he will never be the same again (or maybe they just don't have the legs for it anymore).
I't impossible to "destroy" a player though. I am shit and will always be shit. That won't change sadly, no matter what I do. I might get a little better if I practice more, but my level of ability will always stay the same.
And Ryan Babel's leve of ability is very high, end of story. I'm not sure rafa can unlock that ability, but that's a story for another day.