And that’s exactly the point - who cares if you can bench more than me or Ben? It’s not who is the strongest, it’s who is the fastest.
There is no Bench press comp after the 100 dash - otherwise go try out for a Crossfit Comp 
So long as you have the muscles in the right areas for a sprinter - eg, upper hammies/glutes/lower back ect - then you’re doing the right things.
Weights are there to help you run faster - if they are not, you’re doing something wrong.