Absolutely, I mean you can compare to Sehwag with Adam Gilchrist, but there is no match between Sehwag and Inzamam, both have completely different styles of play. Sehwag always struggled against short pitch deliveries plus the in-swingers because of his no feet movement.
And If Ian Chappel compared Sehwag with Bradman then he also opines about Inzamam being equal to Sachin and Brain Lara.
Plus I very much remember Steve Waugh commenting about Ricky Ponting in his hay days that Ponting is the biggest batsman in World Cricket even better than Bradman but Bill Lawry rejected his point of view by saying Ponting is not bigger than Bradman in terms of playing.
Inzamam-ul-Haq played shots all over the wicket and the one shot that he used to play that throwing off the ball towards the midwicket was a carbon copy of the Viv Richards shot, Some thing that Sachin Tendulkar only dream of playing but he couldn't so far.
Inzamam, Lara, Tendulkar, Ponting, These four are legends man and one of a kind players, don't compare them with smashers like Sehwag and Gayle.
But I don't agree to your post regarding his decline. Inzamam did decline in later years of 2000 to 2003 but then raised as a great batsman again when he was rewarded the captaincy.
You guyz should remember his innings against India in Karachi One Day International. That was the match from where Inzamam raised up again. And after that he consistently performed as a player in the later years till he retired.
After 2003, I always wished to see Inzamam's encounter with Shane Warne but unfortunately it couldn't happen.