Well, you might look at it this way. The average chain carries over 60 cutters and some have over 100. If one or two of them are smaller for some reason, the rest will carry them as baggage. I usually can get 8 to 10 sharpenings per chain, so I figure I can let one or two smaller cutters rest for the next pass. Eventually they all become the same size. Sometimes the side with the extra cutter also has the smaller one that might be left duller so that cancels things out.I don't get too hung up on the length of the cutters. I try to keep them close, but if one gets damaged I'm certainly not wasting the steel on the others to even it up. I go easy on the short ones until the others catch up. Heck, most of my chains have a different number of cutters on one side vs the other, or two in a row from the same side. I've never had a chain that would not cut straight. I think angle and sharpness are far more important.
What amazes me are the stories that men tell about owners that throw away dull chains and never sharpen them, only having used them a few times. Think of the miles of saw chain per year that are thrown away and could have been saved with a simple sharpening job.