Not an expert but that looks like something that started as a grub. They gotta lay eggs someplace.
Bugs this large are usually a non issue, as they are easy to eliminate. The reason why spider mites, thrips, broad/russets, root aphids, are that they generally reproduce very quickly and can hide. A bug like this could be squashed with a paper towel, and is not going to reproduce and build a colony without you knowing.