who would be fastest?

[Joker]

but isnt bart the fastest man ever, i think he even says as much in this past issue...he IS the speed force

yeah, Bart is the fastest man who ever lived

 

[Cyrusbales]

Sentry would win everytime, as he technically is out of the same time loop, so he can get there before flash even starts moving due to time delay....

 

[Kaboom]

Sentry would win everytime, as he technically is out of the same time loop, so he can get there before flash even starts moving due to time delay....

dude, once Barry Allen, and now presumably Bart Allen enter the speed force, they are out of time in a linear fashion and can show up anywhere as well.