.
Rahane's exact mix of strengths and weaknesses does make him a little more valuable than the 42 average might immediately suggest though.
Agarwal averages 45, which includes an average of 100 at home. If he averaged 60 at home instead of 100 I don't think India would win any fewer series. Rahane realistically not being amongst the top 10 or so Indian batsmen in home conditions probably doesn't cost much at all because India win almost all their home series regardless, and his ability to score runs in tighter away series in SENA countries is very valuable.
It does definitely put him on dicey ground. Much like how you can't drop catches if you're Saha, you probably can't have a bad away series if you're Rahane. But I do think he justifies his place even if someone else might average slightly more overall.
The point is he has been given probably the longest rope in Indian batting history and obviously he is bound to come good once in a while with a performance here or there. But overall he is clearly on the decline and at his age, it is difficult to expect him to have another peak of sorts.
And the irony is that it is the same Virat Kohli who has ensured he got this lengthy rope in the past. I just feel that India should have invested in a young batsman like Vihary in this while and could have moulded a capable number 5 of him. Instead the latter gets thrown to the wolves time and again.
And regarding his performances in SENA, his average is 37. It isn't the worst, but for someone who has been retained in the team for away performances, it is not exactly out of the world either. He has been extremely lucky to be in a team of batsmen who, barring Kohli and to some extent Pujara, haven't set the world on fire in SENA.
In a way, he embodies Indian batting overseas during Kohli era - Conservative, traditional and more safe than sorry approach - and ultimately underwhelming. Diametrically opposite to Kohli's approach regarding bowling.
The emergence of the Gills and Pants look promising. And India really need to look out for such options in place of Rahane as well - even look at promoting Pant to no.5 and getting in Jadeja at no.6 and Pandya at no.7.