I can't speak to the firm you mention ... but I can speak to the situation .....
I once had a brief relationship with a GC whose previous EC had left him. Well, it didn't take long to figure out why. I was not able to work with the guy either. Here are some of the little gems that I encountered, over the course of several jobs:
a) New tilt-up, dead of winter, no plumbing. Was pointed to another jobsite down the street, told to use their porta-potty;
b) Every job had charge-backs- my favorite was for two cases of ceiling tiles (to replace one tile);
c) A continually contentious relationship.
It was amazing .... the sweet-talk ended the moment I showed on the site to work. That's when the tone suddenly became 'you're our serf.' I especially loved it the night (working 18-hr. days to get his tail out of a jam) he told me in no uncertain terms: remember, you work for ME. Not after that job, I didn't. Sure, he begged, wheedled, pleaded ... but, at the same time, it was 'ding-ding-ding' with the backcharges, and the certainty that the butt-kissing would instantly revert to abuse the instant we had an agreement. I do electric work, period. I don't need the aggrivation of daily threats of being replaced, etc.
Which, of course, leads to three 'tells' I have regarding relationships.
The first is that EVERY time someone has dangled the 'future work' carrot it has been a dead end.
The second is that EVERY time someone has started out by telling me how 'big' they are, the relationship has been more trouble than its' worth. It seems that when they say 'we're big' what they're really saying is 'you're little and we can pick on you.'
Finally, EVERY time someone has made a point of making sure I know how nice a car they have, how big a house, etc., they have also considered it perfectly reasonable to expect me to live out of the back of my truck and wear thrift-store cast-aways; they certainly aren't going to pay enough for me to do otherwise.
When it comes to doing 'favors,' I want to first see their car, their home. Only then can I decide who needs to give whom a break.