It's strongly implied that the Isan seals are mostly lock and privacy seals. That would make them relevant to rift seal research if the locking seals can provide barriers to slow/stop Sasori or anyone else from gaining access to the rift in O'Uzu. Kagome, who has went through them, dismissed a particular innovation that would have helped PMYF, so I'm not confident that they'll get the appreciation or insights they deserve if offloaded onto someone else. I think they're worth it.
"Hah! Like I'd go back to that stinking death trap! Murderous hicks from the back of nowhere, with their fancy-schmancy ways and their completely unique seal theory that evolved separately from anyone else's for the last few hundred years! Just because she comes up with one nifty trick for reconvolution, she thinks she's all that? Hah! I could tear her stupid theories to shreds! Shreds! Because they're stupid and she's stupid. That whole stinking idea of secondary harmonic tuning across a filled node? Horsefeathers!"
"Wait, she can tune secondary harmonics across a filled node?"
"She likes to think so but hah! She's a stupid stinking stupid person and her ideas are stupid." He nodded firmly.
"I don't know, that actually sounds pretty useful. It would have been a useful technique on the Poor Man's Yellow Flash. Remember how much trouble I had with that?"
Kagome-sensei was in his room pretending that he wasn't trying to reverse-engineer Yoshida's privacy seal (privacy seals weren't an unknown concept—Jiraiya had used them in his last messages to Tsunade and Orochimaru—but Leaf's sealmaster culture had never seen the point).
"'Morning, Hazō, Mari," Kagome-sensei grunted. "Just trying to crack Tsu—Yoshida's latest locking seal. This one's a doozy. She's got me fighting to get through five levels of the primary sealed area before I can even start unlocking the secondary tetracyclics."
"Have you tried—"
"Don't!" Kagome-sensei interrupted. "There's no point if I don't beat her myself."