Let me get to the point, Sakura doesn't need Taunade Lineage to surpass her in power.
Does Tsunade have larger reserves? Yes but Sakura's reserves were said to be horrible.
Tsunade also was pure raw strength but Sakura's CES by Tsunade's grandfathers own words might be stronger.
Now Tsunade's life force on the other hand is something that Sakura could use but that still isn't enough to hinder Sakura from surpassing Tsunade.
Sakura at the age of 16 can use every technique that Tsunade can and she's done each jutsu perfectly the first time she's tried it. Also remember Tsunade said she was the only one who knew the Strength Of One Hundred Healings Technique, which means either Sakura taught herself or Tsunade showed Sakura the jutsu but didn't expect her to catch on.
So yes in terms of ability she's advancing beyond Tsunade.
Does Tsunade have larger reserves? Yes but Sakura's reserves were said to be horrible.
Tsunade also was pure raw strength but Sakura's CES by Tsunade's grandfathers own words might be stronger.
Now Tsunade's life force on the other hand is something that Sakura could use but that still isn't enough to hinder Sakura from surpassing Tsunade.
Sakura at the age of 16 can use every technique that Tsunade can and she's done each jutsu perfectly the first time she's tried it. Also remember Tsunade said she was the only one who knew the Strength Of One Hundred Healings Technique, which means either Sakura taught herself or Tsunade showed Sakura the jutsu but didn't expect her to catch on.
So yes in terms of ability she's advancing beyond Tsunade.