Bingowings said:

I like the white saber a lot but if you want imply that Dooku may be Vader it would make sense to keep his saber red.

Though personally It makes more sense to me to imply Grievous is Vader because he gets into a damaging face off with Kenobi around the same time, he hunts down Jedi, he is already a cyborg and for all we know he could be young and a former pupil of Obi-Wan if you edited it right.

Changing his blades to red and maybe having him breath like Vader would push the fib further than have Dooku pretty much staying the way he is.

i second this. that'd probably be the best way of implying that Grievous could be Vader.