So I'm trying to get this straight as to what exactly Stane's problem was with Tony.
So he helped create Stark Industries with Tony's father...after he died, he took over the company until Tony was 21...by then, Stane had to hand over a company that HE built over 20 years... This doesn't sit well with him but he keeps it in beacuse Tony is a genius.
He and Tony are partners and work well together for many years despite a growing disdain by Stane for the man running what he believes should be HIS company.
So finally, he decides to put a hit on Tony so he can take over the company.
On some level, I'm sure Stane did look upon Tony as a pseudo son and did have some legitamate feelings towards him but at the same time, I also think there is a hint of Stane being jealous over Tony's intelligence and ingenuity.
That scene inpaticular with his engineers when he just loses it and goes, "Tony Stark built this in a CAVE! Out of a bunch of scraps!" stood out for me in the theatre and made me think that deep down...Tony is everything Stane wishes he could be. That office scene with Pepper further reinforced that feeling "Tony is very lucky to have a woman like you" ...
Am I close?