Ignoring the TC's wishes and the purpose of this thread, the very most technically gifted lightsaber practitioners would be (in no particular order):
Exar Kun: creating an entire lightsaber form from scratch within the time span of six months (that was stated to be an improvement over the lightsaber form he had previously trained in).
Ulic Qel-Doma: Fending off an enraged and highly impressive Jedi while physically past his prime, largely out of practise with a lightsaber and after having been cut off from the Force nine years earlier.
Kas'im: Mastering all seven forms of the lightsaber in under a decade (when it's stated in the Fightsaber article that the average time to master one is twenty years) and reaching a level of ability where he was arguably the greatest swordsmen ever decades later.
Nomi Sunrider: Wielding her husband's lightsaber with the skill of a master the very first time she picked one up.
Darth Bane: Being able to memorise every single move and sequence there was to all seven forms of the double bladed lightsaber (numbering in the hundreds of thousands at the very least), and developing the means to counter every single one of them, in a matter of months.
Nobody else has demonstrated an innate ability with a lightsaber to be listed among the above mentioned five.