Isn't Logan supposed to have a heightened sense of smell? I didn't read the story, but couldn't Logan detect the scent of his teammates?
He does and he can. but scents can be recreated to throw him off, its been done numerous times before.
Old Man Logan was a good story, it just wasn't a good Wolverine story to me. SoD is needed heavily to make the whole story believable but outside of the ending, there is nothing Millar wrote that really captured Wolverine's character. I think he could have retold that entire story with Punisher, Cable or any anit-hero type in Logan's place and produced the same product.
There are tons of things that had me scratching my head over the story. Wolverine and a blind Hawkeye (who barely have any sort of relationship) paling around, Logan's first instinct to get the Spider-Buggy, Magneto getting killed by a normal human because "he got old", ANY of the villians even working with Red Skull like that, etc.