thats the basic logic, but if you look at what most of the tour pro's use there seems to be a distinct lack if I's in use and seem to favour the G series drivers. i've seen a comment somewhere thats its because they find them easier to shape the ball with.
In essence that's correct but it isn't hard and fast. I'm not that good but found I could hit the I15's really well and they were better for me than the G15's I tried which in theory were a better match to my (in)ability. Horses for courses and the only way to find out is to go and try some.
K15 is draw bias driver suited more for higher hcaps that slice the ball, its to straighten up there ball flight with the out to in swing.
G15 and now G20 are the most popular drivers at our club and used by many single figure guys as well as mid and the odd high hcapper, because as was said its easier to shape your shot.
I15 is a fade bias driver probably to correct the hook on a strong in to out swing but that parts only a guess.