Couple of other things to consider.
Junior had less resources and man power to do the job. Heck both talked during the project of how OCC had more resources to do these things yet in the end JR will probably win. The reason he will probably win is the hydraulic lift/drop for a kickstand.
Something I have noticed from this show and current biker build off between the two.
Junior is finally starting to do more of what Sr always complained about.
Working longer hours, being there more (for the most part), being on time, taking things more serious from a ownership/management area.
Sr is the type that will probably never be happy, will always find something to complain about, has issues himself that he projects on to his son and has a victim mentality to a degree. However with all of that Jr was a pain in previous versions of the show and I think it went beyond the producers/directors trying to paint him in any light.
I think being on his own has finally made him mature some and take more responsibility instead of taking so many things for granted.
In the split it looks like both have won.
I don't think they will ever have a happy happy joy joy type of relationship down the road but maybe they will be able to respect each other a tad more.