The RM is fairly irrelevant to me. I have enough RMs that are good that I don't really need more. The simple fact that I could equip an RM on him and get him to level 65 is why I want his crystal. He's got a good skill setup for support and an insane SB with his relic (which I have). In any case, no crystal for him, so it's moot for now.
Auto-reflect has some uses I'd imagine too. Throw it, drain strike and retaliate on a single char and you can solo a number of bosses (some of which with mastery!). Sure it's niche, but still better than any of those something-when-critical ones.
As to pulling, the odds don't change (yet) per pull. Eventually there's some boost that will be applied for every pull that isn't a 5* but it's not clear what that boost actually is, even though it's been on the Japanese server for a while now. The only benefit to doing a 50 mythril pull is that you get one "free" pull with it (11 instead of 10). I did the 100 gem pull and one three pull. Got the 5* plain sword which is ok, though 2 points worse than my 6* Giant blade. Still good for Cloud in this event and any other FFVII stuff which is nice.