LM74900-Q1: Query on Transistor to NMOS Gate in the scheme of Power Mux with Priority

Tool/software:

Dear TI Experts,

  Question1: Regarding the following circuit with LM74900 (SLVAFK0 page 6):

  We understand that Q5 transistor in the auxiliary power chain can speed up the turn-on action and we wonder why not do the same for main power chain's LM74900. Or can we take that if we also care about the time which that auxiliary chain switches off and main chain switches on again would take, shall we also add the transistor circuit to the main chain's LM74900?

Question 2 on VS pin in the case of OR-ing application. 

Say, we have two power input rails. In one case, power rail 1 is 24.5V and power rail 2 is 23.5V. We understand that NMOS would be turned off when reverse current occurs in its path. It seems to us that VS pin (power supply of charge pump and others) in the power rail 2 path would be pulled up to 24.5V. Would that influence the internal circuit in the chip? How do we interpret to this? 

Thanks.

Regards,

Yuanchen