LotF:
1. Luke
2. Caedus
3. Kyp
4. Mara
5-6-7-8: Lumiya/Saba/Jaina/Lobi
FotJ:
(-Abeloth-)
(-Taalon-)
1. Luke
2-3-4: Hidden One - Kyp - Darish Vol
5. Jaina
LotF/FotJ
1. Luke
2. Caedus
3-4-5: Kyp - Hidden One - Darish Vol
6. Jaina
7. Mara/Workan
Anyway, that Jacen is 2nd doesn't means he's close to Luke in any way (I'd argue that he is somewhat close in 'sabers tho). That being said, yes, there sre only a handful of people that could do better against Luke than Jacen did - but he's in no way close to Luke, really. Jaina isn't that close to Jacen, either.