I responded to Spartan before I read this... but yeah everything you said I will 2nd.
The only thing you didn't consider as a reason to blockade and starve them out is if you want to poach the strongest/best to join the Vultures and the only way you see to do that is to starve them out and/or make them give up the settlement and disperse... in either case you may be able to force or coerce the strongest survivors to join you.
It still seems very odd... if the idea is to eventually piece together a mega horde they can direct at a target that would be interesting, but again odd.
If you need a mega horde to use as a weapon against an enemy.... head towards any major/medium sized city.... 99% of the population is now zombie.
But if they gloss over that and the plan is to combine all that into a mega horde, it would be... interesting.... what kind of enemy is such that you need to throw a mega horde at it..... another Saviors group?
Sorry in advance for lack of formatting.. Responding on my phone.
The mega horde.... Maybe just a clear cutting measure? Wiping out all humanity prior to engaging...not so much directed to one group but preventative to all groups?
We have seen hordes controlled and used... Maybe using on on a grand scale is the next exciting route? One that is millions strong and not only utilizing what they have, but drawing in all available stragglers as well?
Maybe not to lay waste at all... Maybe to get them all stampeding and picking up stragglers, keeping them moving, and ridding an entire region of them entirely?
As to the vultures wanting to cull the weak and add strength... They seem vulnerable to takeover if that is the case. Get a settlement with 5 or 6 strong dudes, it would be a breeze for them to "defect" to the vultures, slaughter them in their sleep, and keep their settlement free.
Beyond that, even adding strength settlement by settlement offers a diminishing return.
As they get larger, they become less agile and need to take on larger settlements for any gain.
It seems short sighted and dumb.
You hit the nail on the head in your response to Spartan..how the saviors kept them producing... Specifically pointing to negans insistence that people are the resource.
There has got to be more to them than that. If not, they are dumb and not worthy of a full season.
On a thematic note- I am skewing my assumptions of the direction of the show away from what twd has done... I would be let down if they just rehashed the same stories with a different cast.
Overall, strands house was much like herschels farm, but the hotel was kind of a break from the prison- having to deal with the living at the door, being cast out of a society for being savage... An interesting break on the stronghold story line.
The survivalist camp was very "Alexandria" like in many ways... But to seize control the way they did and absorb the old owners enemy was interesting.
By far the most interesting sanctuary was the dam...it was a shame they spent so little time with that.
I am hoping for fresh ideas, and although a mobile ultra-horde is a long shot, I am hoping it happens at some point. They have been weapons on a small scale, now they need to ramp it up.