If you are ordering a toothbar several of the manufacturers will cut the bar to whatever hole pattern you have, IF you follow their measuring instructions precisely and give them good info.
So it's not a hindrance, it just means if you buy something that wasn't built to go on that bucket you'll have to add some of your own holes. It would have to be pretty swiss-cheesy before i worried about closing up any old holes. Whatever cutting edge you are bolting to it is giving all the real strength to that lip of the bucket anyway.