So just to clarify you said Ford only started winning when they bought Holden drivers. Yet Ford actually started winning with Marcos Ambrose who was never a Holden driver, it had nothing to do with them signing Holden drivers.
Let me list some of the Holden drivers signed by Ford and the reasons they were signed or bought so you claim (I'll stick with higher profile ones).
Craig Lowndes - was getting treated like shit by Holden, he wanted to do more marketing for them, they laughed at him, they went testing with out him. So he looked to find another drive - Holden Motorsport wouldn't let him go to another team so he went to Ford. They saw his marketing potential and paid him (probably over paid him looking at his results in hindsight)
Jamie Whincup - a number 2 driver in a bottom 50% team being treated like a number 2 with dodgy equipment - wanted better opportunities but Holden Motorsport didn't want him because he hadn't performed. 888 took a gamble and it paid off - he wants big $$$ ford don't want to give it to him so he and Roland instigated the Holden talks.
Russell Ingall - Perkins couldn't afford to pay him, and none of the Holden teams wanted him because he comes across as a bit of a fruit cake. Stones offered him a decent contract as their number 2, he was lucky to have Ambrose developing the cars for him and was lucky to win a championship because Holden couldn't keep their cars on the track.
Marcos Ambrose took 2 seasons in an AU before he won a championship - if you think that is bad you are hard to impress.
Actually the Ford suspension was a tonne better than the Holden suspension and the Holden teams wanted the Ford suspension. Redesigned aero was for parity and the redesigned engine was actually a Chev decision to no longer make the old engine components and therefore was going to be too expensive to make the components here.
Ambrose being a knob is personal opinion - but then I think Skaife, Tander, R Kelly, Murphy and Bargs are all knobs.