AS for Jefferson and his "Marion" role.
Now, a player at his age can fall over the cliff at any point and I know everyone points to Marion, but Marion had already shown signs of not being who he once was while he was still in Dallas as evidenced by his impact numbers. Marion had already fallen over the cliff or was hanging precariously while holding on with one hand to the precipice. Jefferson trended up last year, so I have hope that he's not going to be a corpse next year, but will actually be able to defend decently and hit open threes. A guy like JJ was perhaps the worst perimeter defender (I would put up the stats, but they would just make you sad) in the league last year so the only way he was a net positive in most cases was if he drained at least a couple of threes to make up for the points he was going to give up. I'm assuming RJ would take some of those JJ minutes even though JJ was used as a stretch four in many instances last year and in doing so, could be a net positive.
Marion, after being a NET positive (i.e., his team was better with him on court than they were with him off court) for 12 of his first 13 years in the league, the Matrix was a NET negative the last four years he was in Dallas (2011: -9.6 ON-OFF; 2012: -5.9; 2013: -5.6; 2014: -9.9). In his last three seasons in Dallas, he was -2.0 on court, let alone ON-OFF. He was -8.0 per 100 possessions ON-OFF against the Spurs in that seven games series between DAL and SAS last year. Marion's ON-OFF of -1.9 here in Cleveland was actually the best he posted since 2010. In addition, his RAPM and RPM numbers had been falling steadily those years and he no longer was an overall plus defender although he was still a stellar defender of the three point shot as he was in Cleveland (top 15% in the league).
We should hope that this is not the year Jefferson falls off of a cliff. If he can play like last year, he can contribute to wins as a player who plays many of his minutes with the team in the lead.
Jefferson looked done in Utah but had a nice little comeback year in Dallas.
He was -.2 ON-OFF, but was in 2 of their top 9 lineups. and three of Dallas's top five defensive lineups.
DRPM: -16 (29th of 81 SFs); ORPM: -.45 (36 of 81 SFs)
OFFENSE:
He shot 43.2% on catch and shoot threes, 20th out of 258 players who shot at least 1.5 threes per game (he was 41.1% last year). That's better than what H. Barnes, Hayward, Middleton, Beal, Isiah Thomas, Harden, Dunleavy, KMart, Manu, Parsons, etc., shot. NOt too bad.
He shot 52.1% on WIDE open threes, although he only shot 29 of them and 40.5% on open threes. He shot 43.6% on wide open threes last year and 41.2% on open threes.
He produced 1.07 PPP in spot up situations, good for 47th out of 131 players with 150+ possessions.
He's still good in transition. He produced 1.30 PPP in transition, 21st out of 192 players who had 70+ such possessions.
DEFENSE:
Opponents shot 1.1% better against him than against everyone else and 1.5% better on threes. He was awful last season (+4.6% and +4.7% on threes). It seems that playing for a "contender" helped him try harder on defense.
He was decent in ISO defense, giving up .80 PPP, 44th out of 104 players who played at least 65 ISO possessions.
He was good in spot up defense, giving up .90 PPP, 41st out of 136 defenders who played 140+ such possessions (ahead of Carrol, Beal, Westbrook, Klay, Tucker, Ariza, Iggy, Hayward, Batum, Giannis to name some).
He was poor in handling pick and roll, giving up .95 PPP, bottom 13% in the league.