Genesis is much more important than any of those skills. It would be a waste to get Angel Ray or Bahamut at all until you deal with Genesis.
I misread your post that you weren't getting a point in Gen right away. I would suggest pumping Gen up immediately, and THEN get all the other stuff. The only truly crucial skills to you are Maple Warrior and Genesis, and Gen is more important. If you can get Gen 30 easily, get Gen up to lvl 15 to get used to the MP drain. Gen 15 drains MP like Gen 30. After you get Gen, pump MW to 9. Save points to upgrade MW to 19 and Gen to 30. Only after you've done that should you begin dumping into other skills.
If you can 2hko Newts with less than 15 Gen, leave it at that until you get Gen 30. Once you get Gen 30 it's worthwhile to max. But save up those points so you can max Gen immediately after passing the book.
If you're going to boss you also need Resurrection. Realistically, Horntail is now worthless and on Zakum, with Pirates, you probably only need one in Res.
tl;dr: upgrade Gen to as high as possible and save up to Gen 30, leaving it at 2hko Newt level; upgrade MW to 9, save up to MW 19; dump a point to Res and upgrade to 10 after dealing with MW and Gen. Then do other skills. I assure you those are less needed for you.
I misread your post that you weren't getting a point in Gen right away. I would suggest pumping Gen up immediately, and THEN get all the other stuff. The only truly crucial skills to you are Maple Warrior and Genesis, and Gen is more important. If you can get Gen 30 easily, get Gen up to lvl 15 to get used to the MP drain. Gen 15 drains MP like Gen 30. After you get Gen, pump MW to 9. Save points to upgrade MW to 19 and Gen to 30. Only after you've done that should you begin dumping into other skills.
If you can 2hko Newts with less than 15 Gen, leave it at that until you get Gen 30. Once you get Gen 30 it's worthwhile to max. But save up those points so you can max Gen immediately after passing the book.
If you're going to boss you also need Resurrection. Realistically, Horntail is now worthless and on Zakum, with Pirates, you probably only need one in Res.
tl;dr: upgrade Gen to as high as possible and save up to Gen 30, leaving it at 2hko Newt level; upgrade MW to 9, save up to MW 19; dump a point to Res and upgrade to 10 after dealing with MW and Gen. Then do other skills. I assure you those are less needed for you.