Your right litecoin's development team have contributed nothing to bitcoin in terms of bug and security fixes in the last serval months and the coin you hold has right ?
I don't know about bugfixes. But Bitcoin #9 contributed exactly nothing in terms of innovation, unlike some other rare examples of altcoins. I'm sure several more teams from altcoin world are able contribute to Bitcoin too, and I suspect they already do. Bitcoin repository has 198 contributors. It's so many, that imo it's unlikely, that there are no some altcoin developers among them besides Litecoin developers. But still, that doesn't make their own shitcoins less worthless.