According to Scott Coker, if Paul Daley wins his “BAMMA” fight, he will be next in line for a shot at the title. Source-http://dreamfighters.com/?p=2282
Nick's boxing is better. Daley hasn't fought anyone of his caliber. There is a reason Daley opted out of fighting Nick on Saturday. He wants to get another payday before losing.
Diaz has never been stopped (save for a cut) so I don't know if Daley will be the guy to do it. That said you can only stop punches with your face for so long before it catches up with you. If Daley doesn't surprise him early, Diaz will overwhelm him.
Nick's boxing is technically better, but he isn't afraid to eat some leather. If anyone can land a KO punch, it is Daley. I really think if it stays standing, he's got a great chance of actually rocking Diaz...maybe even KO'ing him.