Ha! Definitely not the first time we have speculated on which heroes will be needed to unlock Jedi Knight Luke when he arrives, but it is fun to talk about. I think the 5-character assumption is too limiting. JKL's HJ surely will be a multi-tiered event; each tier will have it's own character requirements. More than 5 is likely.
He will be difficult to get. He will require several long-term iconic characters. A while back I was thinking CLS, Hermie, Wampa, Cholo, Rolo ... but that would not generate revenue from the long-tooth players. There will surely be more required characters. I would not be surprised to see both LS and DS.
We need to remember at the beginning of ROTJ, Hermie told Luke that he would have to endure another confrontation with Vader before he could qualify as strong enough to be Jedi. Luke did not complete that test until the end of ROTJ. This opens the door for ESB and ROTJ characters.
What significant events happened to Luke during his journey to jedi-dom in those films?
- Wampa, CLS. Round 1: beat CLS with Wampa. Round 2: beat Wampa with CLS.
- Hermie, CLS. Team up to beat rocks, trees, snakes, and force vision Vader.
- Lando, Lobot, Bespin Leia, R2, Rebel Chewbacca. Team up to escape the cloud city.
- CLS. Lose to Vader.
- Logray, Wicket, C3PO, Endor Han. Fight an ATST and destroy the shield generator.
- Emperor, Darth Vader, CLS. Round 1: beat Vader with CLS. Round 2: beat CLS with Palp. Round 3: beat Palp with Vader and CLS.
So just 2 more Hans, 1 more Leia, 1 more Chewbacca, C3PO.
It probably won't be anything like this.