The fact it's called something different alone and the whole surpassing everyone is doing says to me it will bring about a different technique upon release. 100% sure kishi won't make a lesser version to tsunade's, that would just be dumb.Link to Sakura's seal being an advanced version of Tsunade's?
I'm not denying that her power-up didn't make her strong, only saying that power of that level is useless against the likes of Madara and Juubito.
Comparing Naruto, Sasuke and Sakura to the Sannin is a flawed comparison IMO. Simply because of Naruto having the Kyuubi and Sasuke having an Eternal Mangekyou Sharingan. Naruto and Sasuke represent the duo of Madara and Hashirama more than they do the Sannin because of the powers they use. Naruto relies on his Kyuubi powers and Sasuke relies on his EMS. In this battle you won't be seeing Naruto and Sasuke using their "Sannin powers" much (sage mode, snakes etc). In contrast to this Sakura relies on her "Sannin powers" (white strenght seal).
Naruto is bound to get the other half of the Kyuubi chakra and Sasuke is bound to get a Perfect Susanoo. Those two are about to acquire god-tier powers (Naruto's powers are already god-tier really), Sakura simply can't compete at that level.
To put it simply, the 3-way deadlock simply doesn't exist amongst these three because Naruto and Sasuke represent more than Sannin clones. They represent something much bigger, the elder and younger son of the SO6P (Naruto may represent the Sage himself even).
The sannin parallel does exist and so does the 3-way deadlock, we saw it a few chapters ago. Sakura does have the potential to be able to compete with them in her own right. Even if she can't now in your eyes even more a reason to give her more power-ups, no?
The madara hashirama parallel is sort of overshadowing the sannin parallel at the moment for obvious reasons as it is the edo tensei spamming spree.
There are many parallels in this series and i believe they are all relevant. Sasuke and Naruto are truly on a higher level than her. But she is still a part of the team 7 dynamic and sannin parallel when it comes to them both. So i have no reason to doubt that her getting her present power-up is to assist. To be shown off in a sense like they are. Or kishi shouldn't have bothered giving it to her.
I am not on the sage mode ship 100% because i honestly can't see what seal she is forming behind the speech bubble but i'm not against it because she needs something more. Maybe her seal release will be enough, you never know :3