Improvements on the zombies and their varrients

So we know zombies right they are basically dull and boring and don't really contribute nothing to the game aside from XP like the skeletons have variants and each variet gives something cool like the wither skeleton let's you summon the wither, the bog you can sheer for mushrooms which are a food source, the stray gives arrows! I like how the frostbite is unique having a range variant but aside from normal zombies let's talk about the leader zombies this guy is rarer than somebody's dad coming back with the milk and if you do realize you probably didn't care enough cuz he gives nothing useful so I propose a revamp to the leader zombies give like a new designs like scars and wounds that show it has been in battles and has worked up its ranks to command an army of zombies I think a general like hat could work and it would be like a mini boss fight the leader zombie would only spawn in light levels of 0 in caves or in plain biome. The same could work for the drown, the husk, and even the frostbite each spawning in their corresponding biome. Now lastly abilities 1. Able to summon zombies from the ground when hit 2. Can call other dead mobs to fight back. 3. Call back away to heal 4.summon things like zombies on horses, or chicken jockeys, think about the torment you can put players though it would be a fun challenge Lastly what will it drop... rotten flesh. Nah I'm joking it should drop like a custom item used for upgrading tools and armor that benefit the player in a goodway.