That is your opinion & i respect that, you make some knowledgable & valid points, however i do not rate him like you do, Isco or Reus in my eyes are superior & a similar price. Football is all about opinions you have yours, i mine, i doubt either of us will change our minds :)
Football is not a science m8, any player talented or not is a gamble- How many top players have flopped in England?!- Veron for example amongst many others.
No one can say definately that a player will be a success, Sterling or any player that is proven in the English league has an advantage over a player who is un-tested in the tough, physicality of the premiership, however i think he is unproven & overated, you don't fair enough, time will tell...
I just used Rose as a quick & cheaper wxample their are others & TBH i think he can defend better than Kolarov, going forward is another argument.