Could be off the mark--my training

I would expect some fitness loss on your bike and swim if you've let those fall to the wayside.

More importantly, having a good run in a triathlon is just as much about your bike fitness as your run fitness.  If you can't bike, then no matter how your high run fitness is, you'll probably still have a bad run.  I would almost say that if you had a bad run last race, then you should be spending additional time on your bike, not on your run.

Triathlon is about how well you can S/B/R all together.  I think focusing on just one sport is going to hurt you overall.

I basically did this in ramping up to Boston with very little biking and some swimming since September basically.  I have to pay the piper now on the bike, but I think you have enough time where you would be able to bounce back, especially if you are only talking up to the mary.  What do you expect your recovery time to be like?  I agree to an extent about a strong run being backed by a solid bike, but I also think there is merit to upping the running a bit vs what some folks think is running with 2-3x a week.  For me it is an experiment and I am optimistic that in a month or so both the run and bike will be humming along just fine.  Dont abandon the bike completely (like I did).  I have yet to do any real testing as far as how much bike fitness I have lost, just some tooling around kind of stuff with friends until my legs heal up from the mary.  Good luck!