For Gamers who played Asassins Creed 2 question

I just have a question i didint finish AC2 SO ***NO SPOILERS***

My question is:

Lucy finds desmond and tell her that the real world assassins are dying and there are few of em left and the real world templars are dominating

so she tells him to became a assassin in real life so he can help them but it will take time for desmond to became an assassin but the advanced animus will help him became an assassin and show desmond the way

so desmond play as ezio auditore to learn how he became an assassin so he can understand

is it it or there is something missin