This leads to another question. Are you linked to your 5000 odd Glovers' through yDNA? In one or more cases, given Not Parent Expected events (NPEs), this might not be the case. In such instances, you might be related through an autosomal line. It is also possible that some of your DNA matches, on the short cM (centiMorgan) end of the matter, are false positives (i.e. not really matches at all). Those that you can match on the basis of trees that align with your own (shared ancestry), well, sure, barring any serious error, and, of course, those crop up every now and then, too.