What AQUA said...if you have the room then why not. In the 14 team, 5 keeper league that I had him in, I dropped him because I have Simon and Edinson on my DL (I just picked up Edinson the day before and this is a limited moves league, so I didn't want to drop him) and I needed to pick up a 1B (Thank you Mr. Troy Glaus so far). If I hadn't picked up Volquez, then I would've stashed Kendry for the moment. He comes off of waivers today (????, I guess Yahoo hasn't done their nightly processing yet). I wouldn't be surprised if someone picks him up and stashes him hoping he comes back in September.
EDIT: Yes, he was picked up off of waivers by a team that already has Adrian Gonzalez. Again, if you have room, go for it.