I have seen nothing at all linking Tanaka with the Giants, and you do neglect the fact that the Giants signed Tim Hudson this offseason. I assume Yusmeiro Petit will be back as well, competing with Vogelsong for that #5 spot.
The Michael Morse signing is a nice calculated risk. Can't expect him to post a .910 OPS like he did in 2011, but getting some pop out of left field will be welcomed.
There was a lot of hot air on the local Bay Area radio stations and it was a lot of wishful thinking since we can't afford him. I think the Yankees will probably land a deal.