I got the car back together a few days ago and it is running great. HUGE thanks to everyone that helped out with the timing belt change, the job is much less intimidating now. Not counting balance shafts or a water pump I could probably knock the next one out in 4-6 hours.
Also, maroonmetallic stopped buy with another tensioner arm + mount and it had similar play to the one on my car. Neither shows wear where the arm contacts the mount and both had the correct mounting hardware. I suspect the play is a normal condition and looks worse in the video than it really is.