Yes, this could be the obvious choise. Fits neatly, except... from what I learned from DPC, he does not do obvious. Never the less this is a likely scenario.
My guess is that Man-bun guy is Jill's father. Gordon and that other dude really wanted to impress him, which would fit if he is a Royce. I think the red haired guy talking tax-evasion with the blond one is Sage's father.
Edit: Also I'm hoiping that he is Jill's father. From the few lines he had, I fucking love the dude. I wanna drink him under the table on family dinners after my MC is introduced as a boyfriend.