Agree with this.
Defensively, Drummond & TT could be fantastic and cause lots of problems for other teams. Offensively, not so much. In fact, having two players on the same frontline who can't shoot free throws scares the crap out of me. We'd have to get one or both off the floor at the end of games or it would be 'Hack-a-Drummond' and/or 'Hack-a-Tristan.'
They're both very raw and have a ton of things to work on before they could reach their potential, but until they institute the 3 and done rule .. that's generally the way of the NBA draft and bigs in particular.