"He [Wilson] didn't see eye-to-eye with Greg," Blewett said.
Greg didn't put up with his manner and that's may be why he has come out and said what he has," Blewett in a local daily in Adelaide.
Commenting on the recent spat between Chappell and Indian skipper Sourav Ganguly, Wilson had accused the batting legend of "destroying many careers" during his four-year stint as the coach of South Australia.
"Paul was a different character that some said was pretty selfish," remarked Blewett as he defended Chappell praising the work he put in with South Australia during his two separate tenures.
Blewett's remarks received a thumbs-up from South Australia Cricket Association (SACA) general manager Harvey Jolly who said Chappell deserved credit for shaping the association's "fruitful" youth programme.
"From our perspective, Greg set things in motion which we are seeing the benefits of now," he said.
Blewett termed Chappell as a scrupulous man undermined by a "hard-to-work-with Ganguly".
Despite the BCCI's claim that a truce has been worked out between the two individuals, Blewett expressed his doubts saying it was a "nothing decision."
"I don't think Greg will hang around just to make everyone happy," he said. "I think he'd be fairly frustrated with that outcome."
Blewett, who played 46 Tests for Australia, is unsure whether Chappell would tolerate any untenable situation.
"Greg was appointed to take India to a different level," said Blewett.
"Greg's a man of principles. If he finds he can't work in a certain environment, something has to happen. Ganguly goes or he goes," he continued.
"It is alleged in cricket circles that Sourav isn't the easiest guy to work or get along with," Blewett said.
"I think Greg's e-mail was spot on. I could see it happening before my eyes."