Every time a fossil "gap" is filled by a new find, it creates two more gaps on either side! If you had a complete (and very long) movie film of an organism evolving, you could still argue that gaps exist in the record because the film only takes 25 pictures per second!
Few corpses fossilise. Gaps in the fossil record are therefore not unexpected. Even if there were no fossils at all, the weight of evidence for evolution being a fact is so overwhelming, it wouldn't matter. Fossils are just the icing on the cake.