why did duva tell taylor to go after chavez ??

i was just watching this fight and its is clear that meldrick was winning the fight going into the 12th. rnd...it is also clear that he had also took a beating his whole face was badly swollen and i think he was fighting off instinct from about the 10th. rnd...going into the final rnd. meldrick was exhausted he fought at a very high pace and had thrown over a 1,000 punches also i belive his vision was affected do to do the swelling....duva has been around boxing along long time he has trained some very good fighters so he must of known all the things i have pointed out above....so why did he tell meldrick that the fight was hanging in the balance going into that last rnd. ??? and that he neede to win the 12th. ?? ....meldrick followed his advice and we all knoe what happened..but whay did duva give him the avdice he gave him ???