Well...one point is that the post is entitled "lost opportunities." It does not specify whether or not these are good or bad opportunities. But some might say that an opportunity, implies a favorable change in circumstance, but thats just the Webster's dictionary definition--writers can not be concerned with that.
But more seriously, articles like these must make BK feel pretty good about himself. In the article he discusses two or three players (I won't name names) whose current teams would love to unload them because they are overpaid, injury prone, etc. However, by definition, these players are NOT lost opportunities because we can acquire them at any time and, in most cases, for relatively nothing.