No, not really. During inflation, points separated by a finite distance quickly see the distance between increase at a rate faster than the speed of light in va

No, not really. During inflation, points separated by a finite distance quickly see the distance between increase at a rate faster than the speed of light in vacuum. (This is not a violation of special relativity that says that information can not be transmitted faster than the speed of light.) So, if a collision happened at any point outside of the visible universe, its influence would have quickly been swept away from the edge of our visible universe. The only way that there might have been some evidence left would be if the collision had happened essentially exactly at what is currently the edge of our visible universe. Statistically, this is extremely unlikely to say the least.