Blasi performed well as a defensive midfielder when he partnered Emerson in the first season under Capello. Both Tacchinardi and Blasi weren't placed in the squad regularly and Capello decided to loan the former and to sideline the latter. And in my opinion, I still think that Blasi is a better destroyer than Emerson.
Generally, I think that Capello's choices in the centre midfield are a little bit weird and unreasonable. For example, Appiah's sale was a big mistake, also Giannichedda's buy was a bigger mistake.