Sasuke doesn't have Senjutsu. He can't actually sense/gather natural energy. The curse seal isn't senjutsu either. More like a transformative power boost (via natural energy). He used Jugo's chakra to augment Susanoo with natural energy, which was a "Senjutsu" version of Susanoo. Later after meeting Hagoromo Sasuke received his Six Paths Chakra, the Yin half of his chakra and awoke a Rinnegan. The Six Paths Chakra alone augmented Sasuke's techniques to enable him to attack Madara. It wasn't Senjutsu..

Orochimaru said that Jugo's Cursed Seal is senjutsu (Naruto chapter 648 page 4).

I just looked it up again. I'm referring to Sasuke's curse seal not Jūgo's. Does Sasuke fits the wiki's definition of senjutsu then? I think the next databook should clear all this up. I know for sure Sasuke isn't a Sage and that Jūgo's seal is senjutsu, but specifically regarding Sasuke I feel like the case is more ambiguous.

There was a reason why he had awaken one Rinnegan, and he had received Juubi influence as well which is natural.

What are you talking about? He never had one bit of the Juubi sealed in him or anyting of the sort. All of Sasuke's powers were basically from his EMS and Jūgo's curse seal on Susanoo. Later on it was half of Hagoromo's power. He had never received any power/influence from the Ten-Tails..

That's what I'm saying.

Sasuke may have used senjutsu chakra, but I don't think he's a sage.

Afterall, he can't gather the energy himself, can he?

I'm gonna go with no. Plus he'd have to balance nature energy with physical and spiritual energy. I think he is able to partially manipulate it if anything.

Sasuke had to train hard under Kakashi to become competent in Taijutsu and learn Chidori. Then, under Orochimaru, Sasuke trained to become a master in kenjutsu to the point he was able to briefly hold his own under Mifune, as well as gain Mifune's praise as a swordsmen when he effortlessly killed various samurai during the Gokage summit. Not to mention he developed and learned various techniques, such as Summoning: Lightning Flash Blade Creation and Kirin before his showdown with Itachi. He also later gained his own personal Summon and had ceased using Cursed Seal and Orochimaru's Snakes. He was also very adept at Shurikenjutsu from his training with Itachi and self discipline. Then there was his apparent Fuinjutsu skills and equally potent Chakra reserves when compared to Naruto or other famed ninja. Not to mention even though he had a Kekkei Genkai, he still had to train and naturally progress it through its various stages. Downplay his personal success if you must, but Naruto had just as much handed to him, and gained just as much through his own means as Sasuke.

I'm sure Sasuke had to train that's a no brained but like I said he had things to him plenty times seemed liked it wasn't being a fair balance for Naruto. Now Sasuke beat fodders, fodder samurai let's be real.He barely engaged Mifune in battle. And I honestly think it was cool that he created various jutsu from his lightning release but he had plenty of time to develop techniques. My thing is Naruto got wind release very late in the game. I'm like things could've been different if he came back with Jiraiya with wind jutsu that would seem right, fair to say. There are other comparisons but like I said Sasuke is a strong ninja don't get me wrong but I've seen throughout the series that rather he was gifted from the start or not he kept being gifted over and over again.