Mike:
Yes, I agree top speed is paramount. But, I can tell you that I would have problems improving my top speed with bad fitness.
I've received a bad injury that had me inactive for a year and tried to come back without refocusing on my fitness. Big mistake! I plateau quickly and couldn't handle as high volume of speed work as before and sprinting as short as 150 felt like a 300m.
You are of course also right that general fitness can be improved in a number of ways. Take care…
400:
You seem to be on the right path. Just didn't want to see you go another year on the same path as this… Stick with it, bro. Remember: "1 in the hand is better than 2 in the bush."