Some batches are more lethal than others.
Think of it this way, if you are going to depopulate the planet and 90% of the people taking the "vaccine" die within the first two shots you simply won't be able to hide the deaths.
Instead, only let a few of the batches at a time have the lethality. Give the politicians the "safe" ones so we can avoid the "X politician died after taking the vaccine, they are poison shots" stories.
Then, gradually ramp up the ratio of killer shots in circulation (it's kinda like the analogy of boiling a frog).
Then push booster shots to "circle back" on the ones that got the earlier "safe" batches and they will all start dropping like flies before they realize what's happened.
Another analogy is in how you poison an ant hill. If the poison works too quickly, then the ants will never get a chance to take it back to the queen. I hope this angle doesn't apply to the "vaccine" shedders...
Thoughts?
Edit: To clarify, I think all are going to kill people. Some batches are just more lethal than others.
Something else to consider. What is chemo therapy? It's a way to treat cancer with toxic chemicals by using poison that will make you sick and hopefully will kill cancer cells first since they grow fast and kill some good cells but not enough to kill you. If the vaccine kills mostly old and infirm that sounds like a communist way to reduce the most non-productive people. Give according to your ability, receive according to your need. Old people don't produce anymore, they only consume food, health resources, etc. The fact that most of the people who die from the vax are older, I'd start there if I was looking at a planned eugenics program. Who knows what will be the next injection or consumable they push on us to take. It might kill off certain races, blood types, those predisposed to certain deadly illnesses.