So I fully understand the math and know how to efficiently level my skills, but I have an OPINION question!

So through a series of events (read: ffing gacha) I have some useless SSRs. For example, I have a MBL Ixid blade (thunder sword). I ALSO have two other unbroken thunder sword SSRs!! Have the Cursed Sword Gleipnir (Defender), and the Sword of Kusanagi (also Defender).

So compared to a full MBL assault SSR, they're worthless, and though I suppose I could level them to 50, the odds of me ever getting more copies of them is essentially zero. Even compared to the full MBL Thunder Assault disaster weapons, they might not match up.

Of course, getting the extra SSRs to 20 would be better than the disaster SRs, but it would be a significantly higher investment of resources, and I honestly don't know how the stats of the weapon themselves would compare. I can tell what the disaster SR will be at max level, but I have no way of knowing what an unbroken SSR would be at.

So: should I use them to max the skill level of my other SSRs (which require a boatload of points!) or save them in the off chance i get more copies, or even save them to use them? (3 options, pick one!)