I'm not sure what your point is. If someone says that a player can not play first base well enough to be a regular there, and someone else points out some others that were just as bad or worse, but still played first base well enough to be a regular, isn't that a valid point?
Certainly, it boils down to whether his bat is good enough to overcome any defensive weaknesses. But there HAVE been some players whose bat WAS good enough to overcome similar defensive weaknesses, so ruling him out on that basis alone is foolish.
No, it isn't because the only thing that matters is whether or not Daniel Vogelbach is a good enough athlete to play first base and the overwhelmingly consensus opinion is that he isn't. The only differing opinion is that he MIGHT be able to play first base a little bit, on occasion.
However, some fans and message board "experts" seem to think, for some reason, that he can not only play first, but left field, third base and even CATCHER because some fat slob in bygone years played there.
Whenever an actual professional writer, scout, GM, or some other person with inside and/or first-hand knowledge points out that the dude just isn't gonna be a successful defender on an every day basis, some fan will drag up some sloth that used to spend some time at a defensive position a million years ago without pointing out the circumstances surrounding that sloth's employment.
Ron Coomer, for instance. Let's just look at him, shall we? When he was with the Twins, he was an All-Star! Surely, if a weak hitter like him could play first or even third base then a masher like Vogelbach can play first base! Well, no, actually, Coomer was an excellent fielder as a first baseman and a below average third baseman but he wasn't so bad that he was a joke over there early in his Major League career. He may not have had Keith Hernandez-like range at first base but he had soft hands over there and he didn't kick a whole lot of ground balls.
Also, the Twins were a small market team and didn't have any high priced players on those teams, to my recollection. In the years that Coomer was playing first and third for them, they finished no higher than fourth in the AL Central. Ron Coomer isn't a positive argument for fat dudes, IMO, as his highest OPS+ was 111 and that was in 253 PAs.
OK, John Kruk. He was fat. He was a good hitter. He was no gold glove fielder. He is an idiot. Vogelbach can't possibly be any worse than Kruk! Well, I'll give you that Vogelbach can't be dumber than Kruk. That's a fair point, for sure. But, as JR pointed out, Vogelbach is simply a butcher in the field. Kruk may not have been a gold glover but he wasn't a stone gloved hack, either.
Frankly, I still believe all this arguing is moot. I maintain that the National League will have the DH in a few years and everyone will be able to exhale and stop kvetching about Vogelbach and his oafish defending.