i dont think the yellow flash is alive because he's my favourite character but mi theory has a backbone even though it might be small. ok here:
since yondaime was chosen over orochomaru r however its spelt to be hokage then he must have a strnger n better ninja than orochomaru. when orochimaru was battling the 3rd he summoned the 1st n 2nd hokage. orochimaru was able to go toe to toe with the 4th, and yondaime was probably stronger than him why didnt he summon yondaime too?
Thats probably because he is not dead. well thats how i'd like it to be but whatever.
that should be "i think the yellow flash is alive"