The Blazers obviously had interest in Jackson if they wanted to bring him in for a workout. But he isn't working out for any teams.
If the Blazers really gave him a promise, why would they even have a workout scheduled with Jackson? Maybe that was just a smokescreen so that isn't so obvious.
All signs point to Reggie Jackson getting a draft promise from the Portland Trail Blazers with the 21st pick.
It isn't a fact. Sources agree on this theory, but nobody has confirmed it. However, it makes plenty of sense. The evidence is there that the Blazers may be the team that gave Reggie Jackson a promise.