Jester David
Hero
Battlemaster, mastermind, and PDK are sub-classes.
That's like saying that eldrich knight and arcane trickster and acolyte are enough to be a wizard. Sure they can cast spells, but they still need to spend much of their time hitting things.
Noble sounds like it's a decent contender though. Didn't look at it.
I'm not sure I entirely buy this argument.
The crux of the argument seems to be that the warlord was a class in a past edition, and isn't a full class now, so the subclasses cannot be the warlord. But the assassin, favoured soul, illusionist, scout, jester, wild mage, and cavalier have all been downgraded from full classes to subclasses and work just fine. And the eldritch knight, arcane trickster, and assassin have been downgraded from 10-level prestige classes to subclasses with a handful of features. Heck, the ninja was even folded into the Way of Shadow with the shadowdancer, so neither even have their own name anymore.
Subclasses did not exist in prior editions (at least not as we currently know them), so the warlord could not have been a subclass. It seems odd to limit the design of an option for 5e based on limits from a past edition. It's like saying a 2nd Edition kit updated cannot be updated as a feat as it wasn't originally a feat.
Heck, even at the end of 4e, the warlord was fading as a class, being omitted from Essentials. Had that line continued, we might have seen a leader variant of fighter similar to the cavalier and slayer, replacing the warlord like the Essentials ranger replaced the seeker.
That's the nature of the hobby: options should be designed to best use the existing design space, and old ideas and options should be used as inspiration for new ideas.