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TPS61261: What are the functions of the 2- NMOS at high side?

Part Number: TPS61261
Other Parts Discussed in Thread: TPS61023, TPS61094

why set 2 NMOS in series at the high side of TPS61261?

Refer to datasheet, My understanding is that:

1.The R-on resistance of the right-NOMS play the role of Current sampling resistor, so the right-NMOS is common high side switch

1.The left-NOMS play the role of LDO, so when VIN is too large, the left-NOM can share some voltage from VIN