You scoff at the odds of Greg Oden playing an extended period but pin your hopes to the Blazers having an undrafted free agent with a lot of talent available right when they have an injury exception?
If you consider low probability things to be silly to factor in, you should be consistent. "Guys like Wes Matthews" (that is, players with better than average NBA talent that every other team missed) come along, but extremely rarely.
No, that's not what I say. I'm sure there are things that exist that you and I are unaware of. I just see that teams almost never find impact players with these types of exceptions and, from that empirical observation, fail to find this development to be worth great disappointment.
Also, I have no particular reason to believe Cho and his front office are extraordinary and therefore able to identify that one guy that every other team missed. I certainly hope he is, but chances are that he isn't. In fact, I'm not sure anyone is. I don't really recall any GM/coach making a pattern of finding significant NBA players that every other team missed. Generally, guys like Matthews are discovered as lucky strikes. In my opinion, anyway.
I'd have been fine with Cho taking a random gamble on some NBADL guy. That guy could be better or worse than Marks...but the chances of that player significantly affecting the team's present or future is beyond slim, as far as I'm concerned. That Cho didn't bother is not a big deal to me. Your mileage may vary.