The fourth and final Test ended in a draw after wet outfield led to abandonment of the match at the Queen's Park Oval.
As per Kohli, Saha was India's biggest gain in the Test series against West Indies which they won 2-0. The skipper was also satisfied with the team's overall performance in the series as India registered their consecutive series win over West Indies in the Caribbean.
Apart from Saha, all-rounder Ravichandran Ashwin performed exceptionally well on the Caribbean tour. He was adjudged the Man of the Series for his all round performance with the bat and ball.
"It's been a pretty good tour for us. We had come here looking to improve in a few areas and we have done that. For me, the biggest positive is Wriddhiman Saha getting runs in the lower order, plus R Ashwin coming good at no.6," Kohli said.
Both Saha and Ashwin had scored a century each in the third Test to help India recover from the top-order collapse in the first innings.
"I hope we can keep on improving this aspect of our game because there are positions, which matter a lot in Test cricket. Whenever teams have done consistently well in Test cricket, their lower order has always contributed. So, those were the areas for us to solidify," Kohli said.
Only 22 overs were bowled in the rain-affected Test, but India's team selection was once again a surprise. Both Murali Vijay and Cheteshwar Pujara were included in the playing eleven as the visitors went in with four bowlers for the first time in the series. Kohli provided the reasoning for the decision.
"We lost a Test in Galle (on the Sri Lanka tour last year) when we were a batsman short. Even in the home series against South Africa, we were struggling on quite a few occasions because of lack of a batsman. So we wanted to try this combination out, though the game didn't happen here.
"If we play four specialist bowlers at home we may not need the fifth, because if you play with three frontline spinners at home, it probably does the job for you. So we thought even if we play two spinners and two pacers, Rohit (Sharma) and Vijay can give those 10 extra overs. Away from home you need all your best bowlers playing because you don't need how the wickets will play.
"We are going to play world-class sides at home who are going to capitalise on the window of chance we give them. So it was just something we wanted to try out. We should be flexible," he explained.
(With inputs from agencies)