That PI polle position was on an outclassed, but well developed, balanced bike. The ilmor is not this, and he is never gonna get on the front row without some miracles.
As for Pitt, at this point in the development, he is no disadvantage to the squad, and on no level will he be holding them back. Weaknesses elsewhere will easily cover his deficiency. Also, if i was yamaha management i wouldn't have thought twice about ditching him for Corser, its a no brainer.
It easy to forget that the ilmor squad arn't just new to motogp, they are actully new to bikes in generall. So i expect i long road ahead of them, i hope they stick it out.