Sorry, was away from the laptop (I still have a flip phone). I don't recall Betts' name in trade proposals for Hamels, but looked up the timeline for the rumors -- winter after 2014 -- and after Mookie's first 52 games in which he had a 2.3 WAR, which multiplies to about a 7.0 for an entire season. He was an untouchable for me even then, because of all his tools it was his wrists that looked quicker than any I'd ever seen (and only read about on a young Hank Aaron).
I do remember Swihart's as the most prevalent name in Hamels trade talks, and obviously in hindsight we'd all do that swap... but I was ok with it, because Boston needed an ace after basically dumping an entire rotation, and catcher was a position of prospect depth; even though some predicted Blake would be the next Posey, we still had Vazquez, who was billed as the next Molina, and worked out with the brothers in offseasons (I also remember Shaugnessey saying, "if you don't want to give up Swihart, then give them Vazquez"). According to Cafardo, here's the Sox actual proposal -- and why they didn't land Hamels: Allen Craig and Daniel Nava?!?!
I don't remember the Nomar for Neagle talk, but have basically been against trading good position players for pitchers. I hated Reddick for a reliever, but didn't care that Manny for ARod included a throw-in minor leaguer named Lester. It's not hard to imagine that if that deal had stood, Boston might still be looking to break a -- what, 100+ year old curse...