Yes, but they have definite proof pf was at kb's on 11/22..and for quite a length of time. (He just didn't pick Baby K up and leave). And he ALSO told a pack of lies to cb. Now if pf wasn't caught on surveillance, and he wasn't caught lying about his whereabouts after his wal mart trip, and if the pings of his and kb's phones weren't traveling together, and if he hadn't filled out custody papers, that might cause reasonable doubt for him; but that's not the picture we're getting. The jurors are most likely going to figure it out.
Even if kk had been there on 11/22, and she high-tailed it out of there the SAME day with kb's phone pinging with hers, it still wouldn't mean pf is innocent. It could make her guilty (along with pf), though.
The speedy plea deal might be to get baby K into good hands. You actually can't tell what pf is capable of doing to hurt the B family. If you're going down you might take others with you. And I think LE has plenty of evidence so they decided to make a quick 'chess' move.