Well I don't think spectre is THAT good anymore what with the several nerfs to dispersion. It used to be she was THE lategame carry simply because she killed everyone around her if you tried to kill her and only the tankiest of tankiest heroes could actually survive, at which point though you could either just buyback haunt or win the fight because 4 of the enemy team was dead from killing spectre first. Nowadays though as long as you stay sufficiently far, you don't take that much damage even as a support and the buyback thing is only so good due to the buyback several nerfs and her lack of actual fighting power once she's done doing that.
I think she lost her super lategame goddess status a while ago. Void is still definitely up there though since he got several buffs in comparison. Lategame void can 1vs1 any other carry pretty much if he chrono them and if he catches 3people in a chrono there's a good chance he just won the game. PL/Naga are all also fairly fucking gay lategame as they kinda do what spectre used to do, then can send shitty illusions at most heroes and they'll just die if they don't run away. CK and Tiny are the damage beasts lategame and assuming they're farmed most other carries can't outcarry them fuckers. CK especially, shit I think lategame CK can potentially outcarry everyone else including void as long as he can survive the chrono(disruption, swap on void that kind of shit but still not that easy). The fact he more or less one shots everyone everytime rift is up when he has illusions up is pretty crazy and his illusions are fucking tanks, you need like several sheeps/diffusals if you want to kill them.
There's a few sleeper carries too, Sven for example even after all the nerfs is probably quite a beast still if you get to a good lategame. Antimage hasn't seen play in a while but his ult is fucking ridiculous nowadays, if you can land an EMP from a wex invoker he can rampage one shot your entire team even if you're not like completely sitting on top of each other. Like it covers the entire roshan pit, you try to take roshan after a tough fight where you won, he buyback, travel to a creep, blink near and ulti the pit, he kills the entire team easy.