Correct me if I'm wrong by my understanding was that you have a clear disadvantage if you have to go down the icp route rather than wings route.
The disadvantage being that after completing the basic training on icp you would have to apply to go down the ATP route, which would mean having to be successful on a selection day, paying more money and being put in the ATP hold pool.
As far as I'm aware the ATP hold pool is only utilised once the wings hold pool is empty, therefore every time a wings course finished you'd be put behind the 25 or so wings cadets that would get priority over you (and that's assuming there are not more wings cadets already in the hold pool).