Shaykhul-Hind (Maulana) Mahmud al-Hasan (RA) without a doubt as just about every movement of Islamic revival links to him.
But if you ask the DeoCons their own Shaykh (depending on who you ask).
I have read the Hadeeth which you have quoted but I believe that we cannot decide until the end (of the century) and in my humble (and unqualified opinion) the Mujaddid of this century has yet to come.Allah knows best.
I am not a Shaykh :P
This is not the only Hadeeth on the topic
Khialfah was abolished in 1923 and it will be re-eastasblished somewhere on Earth before 2023 and that is what the Hadeeth implies. Where that would be and who by, don't know.
This cannot be undone and I am sure it will be greatly appreciated.