The only advice is don't pull unless you have saved about 60 scrolls, and only use scrolls in a treasure you're determined to get a Ninja in, most people waste scrolls by halfheartedly using them here and there, it doesnt work that way, roughly every 60 will get you a "banner Ninja" that causes an announcement and is probably pretty good, with Super Rare Ninjas requiring a certain threshold to draw.

Seal Treasure: A waste of scrolls, all those Ninjas are free.

Tendo Treasure: Pains are still good but it's still kind of a waste as Tendo Pain and Hashirama require 400 to get and Tendo is almost a free character and Hashi can be acquired elsewhere if you're lucky and the Pains are mostly free but tedious to get.

Sage Treasure: Sage Naruto is fantastic but he also isn't worth the 100+ scrolls it might take to get him since it's a 1/3 chance of drawing him as the first Banner ninja at 40-60 scrolls and then 120 for the next banner and 160 for the 3rd banner, Ao & Orochimaru aren't nearly as valuable as him.

Edo Treasure: Not worth it if you're looking for good all-round characters, GNW Tenten is a possible "Draw 10" in it which is very, very good but still not worth putting scrolls into in my opinion if you don't get her that first time.

Kage Treasure: Probably the best one to use scrolls in, The banner ninjas are at every 60 scrolls and you're bound to get someone vital if you use between 60-240 scrolls, Sasuke & Ay require like 800-1000+ at the very least to have a chance of drawing them, but if you get Mei or Danzo or Darui as your first kage ninja then you're doing okay.

Jinchuuriki 1: It's a specialized treasure, you have to really want Roshi and the other Jinchuuriki to put scrolls in here, the Ninjas serve specific purposes and Roshi is arguably the best of them in this treasure but he needs like 210 to get.

Jinchuuriki 2: Same as above, Han is a lot more universally useful than Roshi as he can remove buffs and even the playing field in a lot of fights but again Jinchuuriki are the sort of thing you use scrolls on because you know exactly what/who you need.

Keep in mind there are 2 types of Seal Rebates, the generic one that goes up to 300 seals and in return gives you a significant number of temporary scrolls that have to be used in 7 days. And the other rebate they give you a choice between 1-2 specific treasures that you need to draw from to qualify for rebate, that one gives you scrolls but they're real permanent scrolls, so you're not forced to burn extra scrolls in something you weren't planning on, you can instead have a head start on saving your scrolls for future treasures or whatever.

Unless there's a screenshot showing that happening, that cannot be possible.

But can he actually be drawn? Several characters have incorrectly listed locations they can be obtained from but it wasn't actually possible to get them from there.

For example Tobirama was also listed as obtainable from Seal Treasure, but you couldn't actually get him from it. Hashirama doesn't even have Tendo Treasure listed as a way to obtain him.

Basically that stuff is wrong for a lot of characters and always has been.