Problem is that you don't understand my case either because my english is not good enough or simply because you want to disagree.
I give it another try:
A skilled offensive player may get reduced to a certain role, if he is playing in a balanced offensive team, but he can step into a bigger role if necessary. So from my point of view it doesn't matter, if Bosh was mostly in the same role like Mclemore or if Chalmers was like JT. If necessary those guys could step up, hit big shots, make plays on offense. JT won't do that for our team.
The standpoint, that all we need is a defensive roleplayer doesn't show the whole picture. A player that defends at a high level AND is able to step up on offense when needed would be a better fit.
Problem is, if such a player is available for the Kings. But when we draft a defensive roleplayer or Moreland shows some improvement, we would be in a position to mix it up with a capable offensive PF and adjust our strategy to the opponent.
Chalmers and Allen didn't make big plays for Heat, unless you count running into the corner, and hitting semi-contested, even if unbalanced shot after Bosh's rebound. I would imagine, Mclemore being able to his such a shot after Boogie's rebound rather soon.
Perkins and Tony Allen certainly lack shot-making ability. Let's call them JT for their respective teams.
The bolded part of your post actually is the whole picture, Kings management should focus on this off-season due to limited asset pool. With some money to spend in summer 2016, and framework of hopefully PO team by then already in place, Kings could look to upgrade certain areas.
Kings biggest needs are another
defensive-minded PF, who doesn't impede Boogie/Rudy on offense, and is able to guard perimeter effectively, since that's JT's main weakness, and a guard off the bench, who can create his own offense, but also doesn't affect spacing (at least average defense, if possible).
An array of rather obvious qualities for the new starting PF, I mentioned above, is a
necessity, that maximizes this team's ability for the same amount of assets spent. Get worse defensive player with better offense, and you are actually costing Kings production, since offense barely sees any improvement, mostly redistribution of shots, but you worsened defense - you are decreasing peak ability in exchange for redundancy. Bigger offensive ability coupled with unselfishness (notice, that your more capable offensive player must be willing to play in a diminished role) and similar defensive play is a luxury, that Kings don't have assets for this off-season (I would like to hear names of such players though). At the same time
minimal offensive competence is also a
necessity, which means defensive guys, who has no game outside the paint, i.e. impede Cuz/Rudy offensively, better be NBA defensive team material.
Moreland is irrelevant at this point. He's 23 already, still basically a rookie, still rather small and had same shoulder injury twice already. If you get anything out of him, maybe it's Pollard-level big in 2-3 years.
As for the guard Kings will most likely have to ask Miller to keep playing and return for another year. I don't think, Nik is ready to go in November, so Kings need a guard to work with Miller in backcourt (need good shooting for that). At the same time team does need some redundancy of guard play and in case Andre is unavailable Kings would need some playmaking as Ray may function as a defensive PG in the starting lineup, but can't create wel enough for bench unit. That's why I mention Stuckey repeatedly - he's one of the few, who has passable defense and is a fit offensively as he can reasonably well both off and on the ball.