To avail oneself of 1080p, one needs HDMI. The best one can get via component video is 1080i.
Of course, you can always run the HDMI video directly to the TV. You can't pass the upgraded blu-ray sound through coaxial or toslink anyway.
If the 2012 has analog audio outputs and the 3805 has the corrosponding analog inputs, you CAN use that to pass the blu-ray audio to your receiver. That's what I do with my 2802