I've been looking into Greg Maxwell quite a bit recently. All the core devs actually (except Wladimir), and the blockstream people. Greg seems a sincere and extremely intelligent fellow with the right kind of bent for the job. The way he
knocked the wind out of Stellar's sails on Hacker News was quite something, just as one example.
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My sense after observing things for a while here is that Greg is actually a fairly patient person except in instance when the other person really ought to be doing better. I think that in addition to having significant inherent differences about the role of Bitcoin he has also lost patience with Gavin who is, by his own admission, not the brightest bulb.
On top of that, everyone who is anyone should be mortified at Gavin's slavish devotion to Hearn and the Bitcoin Foundation crowd who can be counted on for atrociously bad ideas by the standards of most early adopters. I'm sure that this is a contributing factor to Greg's loss of patience. This unbelievable scenario should make almost everyone 'run, not walk' away from Gavin, and I suspect that it was a major factor for Blockstream getting some wind in it's sails.