Hulk: From what I've read, you can get increased ester formation from over- and under-pitching. If you underpitch, you're more likely to have increased fusel production, decreased head retention and lacing. "Standard" pitching rate is 1m/*Plato/ml. So for a 5 gallon, 1.050 batch, that's 1m/12.5/20k ml. So it'd be about 250b cells total, for a "standard" pitching rate. 3m/ml would be 60b, 6m/ml would be 120b.
I wouldn't recommend pitching that low. The pros that pitch 6-7m/ml are using very fresh, very healthy yeast which you don't have access to.
Assuming your yeast wasn't abused along the way, yeastcalc tells me your pack should have 69b viable cells, though I think their vitality would be quite low.