training one technique for a year might not help your other techniques, but think of how effective it would be. Maybe the person can spend that one year to tackle every manner of attack with an ikkyo.
We know there's like a hundred variations of ikkyo, depending on the situations. So it may not be as useless as it sounds. I imagine that the person doing it can consider himself a researcher.
It's not exactly aikido, and it's not fun. But maybe it'll be useful. Justin, If you do this, do write an essay.