Lebron weighed 20 lbs more than Porter in his rookie year. I don't know where you're getting 50 lbs from? From Where? So Lebron weighed 240 as a rookie and Porter is currently 190. Please. Porter is listed at 215 right now.
A better comparison is Klay Thompson. Klay was 10 lbs lighter than Porter his rookie year. He has put on about 10 lbs of Muscle since he's been int he NBA. Porter can easily put on another 10 lbs if he hits the gym. He would still be bigger than Klay.
A better comparison is Klay Thompson. Klay was 10 lbs lighter than Porter his rookie year. He has put on about 10 lbs of Muscle since he's been int he NBA. Porter can easily put on another 10 lbs if he hits the gym. He would still be bigger than Klay.
At his peak weight LeBron James was between 270-275 lbs* which is 55 - 60 lbs over Porter. These days I'd guess he's closer to 255 lbs which is still 40+ lbs more MPJ.
As a rookie of course he was lighter. He also didn't play PF or post up nearly as often. My point is that Porter isn't physically ready to play PF primarily. He's got a very underdeveloped lower body and is easily pushed off of spots making him unable to guard the post or hold position to rebound.
And I'm not quite sure why you're using Klay Thompson as an example. He almost exclusively plays SG. Coming into the league 10 lbs heavier than Klay isn't a convincing argument that Porter is a PF.
*https://www.google.com/amp/www.nydailynews.com/sports/basketball/lebron-james-gained-pounds-game-report-article-1.3884234?outputType=amp