I want to say there is a couple short and chubby twili in twilight princess outside of the castle in the twilight realm.Yes but was the king of darkness not also Ganon? Are you saying this guy is Ganon and they decided to put him in after all to fit with the timeline?
As for the tall and slender thing, If a big muscular guy with a huge bone structure and fire for hair got sealed and had kids, those children would probably inherit those genes.(a gene for flame hair, why could I not have been born with that?) Big people have big kids in the majority of cases. If there were a group of tall slender people then the likelihood is that their parents were tall and slender. That is what I'm saying. No Twili resembles this giant King of Darkness, but there are similarities to Ghirahim seen in Midna and Zant. I'm going on the Twili we have seen. In reality we do not know their number but I doubt we ever will see any more.
So not all of the twili in twilight princess were tall and slender.