Safe answer seems to be that 1 and 2 studs support a landing that supports both upper and lower staircases, so I would leave them there. I can't see enough of the whole structure to suggest something else.
I really don't see a problem removing #1 or #2 cripple, not both though. You really need to install a header at the top of your stairs there is just not enough support for the three stringers at the top.
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