Kasen Williams was a totally different situation. His game was based on athleticism, not football IQ.
Bobo could still get cut, but it would be more for physical limitations.
I get what you're saying though, getting overly attached to "camp bodies" sets us up for disappointment.
There was another WR a few years ago, maybe 5 to 7 years ago, UDFA or late rounder, that made an impression in TC but got cut, to howls of protest on .NET. Can't remember the dude's name, but he didn't ever light it up elsewhere. If there is one position group the Seahawks braintrust has consistently done well on over the years, despite a few misses, it's WRs.
Misses: Gary Jennings Jr., 4th rd; Amara Darboh, 3rd rd; (Hit on David Moore, 7th rd); Kevin Norwood, 4th rd; Chris Harper, 4th rd
Mixed: Paul Richardson, 2nd rd; Kris Durham, 4th rd (Durham later had one decent year with Detroit)