Agreed on all points. Elson wasn't perfect, but he contributed to a le. Butler lost interst after getting paid.
All that said, the Spurs did throw money at size that year, and it's probably understandable if they're a little snake-bit about it. I'll never mind taking a flyer on size or size combined with defense. The offensive abilities of the Spurs at this point make the addition of a defense/blocks specialist a worthwhile ambition, even if he can't shoot a lick.