Very interesting data. The lack of singles certainly lines up with my eyeball observation, but I hadn't thought to consider total bases. For a powerhitter, Phelps SLG off his card is certainly anemic. But singles are part of SLG and with so few of those, and few doubles, he's got to get it all but homers.
I think this shows that there's a good reason why we've been avoiding Phelps and others of his ilk despite their impressive OPS's. After a brief trial of Phelps in my current season, I went to Kemp, who has been both a lot cheaper and a lot better. :D