With the Caps, Mantha was the same problem as PLD. Laviolette did no good in getting Mantha going, but with a new, young coach in Spencer Carbery, the right buttons have been pushed so far to click with some line mates and have some successive offensive production. Those line mates happen to be young up and coming players for the Caps. Maybe PLD needs the same, but no guarantees. PLD is talented but I have noticed when he's given too much freedom with the puck, he tries to do too much like try to go through 2/3 players at once and lose the puck. Maybe he does that bcuz he doesn't trust his line mates? I have also seen at times he can make some good seem passes but his line mates mess up the possible good scoring chance. Since the Kings aint firing TMac any time soon, I would say to have PLD play in a shooter role while his line mates do the grunt work. Going back to Mantha, he started out on the 4th line to humble him and compliment offensively the hard working 4th liners. Once he built some chemistry with them, Mantha started to work his way up to a top 6 role after being humbled. As of late, Mantha has worked well with Connor McMichael being his center and Alexei Protas(6ft6in) being his opposite winger.
Coaching players is a tough job. Finding the right players that work together is not easy. Personally I think line match-ups and line combo's is a weakness of TMac. He has never been good making in-game adjustments. Tmac has yet to get the best out of Fiala/PLD and it's partial to hurting the team, magnified on nights where they lose to a team like the Kraken.
Oh forgot to mention Mantha was scratched a few times to send a message. Maybe PLD needs the same, but TMac has to have the pucks to do it!
One more thing Mantha of course a winger, while PLD is a center. Maybe PLD needs to be delegated to playing wing to limit his liabilities?