He will now dress as part of their 53 man roster for game days.
Oh, are you asking why they would do this when Tannehill seems to be doing fine and there's no other rational reason to bring him up? Well, then you must not have heard that the Bengals attempted to sign him to help in their time of Andy Dalton-less need.

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But MIAMI SUCKS....and....well no that's it.
They must be really hurting at TE...
You can never have too many TEs.
The linked article said they released an OL when he came up. So, maybe Miami is following the QB<->TE<->OL model. /s
Alriiight. Do it big #3!
The Tyrod path to starting is good enough for Logan, too!
the way tannehill is choking I wouldn't be surprised if they tried to work a trade of some sort. I hear the browns could use a qb and are great at making dumb decisions so Tannehill's contact would be easy to swallow.
Teams now fighting over LT3? How about that.
Just excited that he is getting another shot. I kind of figured his run was over when Miami cut him to the practice squad.
I'm still disturbed by the fact that Bruce Arians was willing to let Ryan Lindley set football back 75 years in that playoff game vs Carolina and didn't even give Logan a second look. I get that Logan probably "wasn't ready" but I can pretty much guarantee that it wasn't getting worse than Ryan Lindley that night.
I don't know. Bruce Arians is a great coach. Not sure he would have left Logan on the bench if he thought he would have been better. The NFL is all money and people get fired over losses. That was the biggest sign to me that Bruce Arains no longer thought Logan was an NFL QB.
100000% agree
Arians releasing LT didn't necessarily say much of anything about his thoughts on LT in the long term.
Arians had a healthy Carson Palmer and a veteran back-up Drew Stanton. Arians likely felt he had a championship level team - and keeping an extra non-QB vs a 3rd QB who wasn't going to see the field (and might clear waivers) was a no-brainer.
I strongly suspect if LT had cleared waivers, he would have ended up on the Cards practice squad, but the Dolphins snagged him. If the Dolphins were in the playoff hunt, I doubt they would have put LT on the 53 man roster either. But they're not, so they had little to lose and everything to gain by keeping him from getting claimed by someone else.
It's a numbers game and teams have varying reasons -- not all of which have to do with current or potential talent -- for keeping either 2 or 3 QBs on their roster. In the end, LT is no more or no less the #3 guy on the Dolphins today on the 53 man roster than he was yesterday on the practice squad.
EDIT: But he is getting paid more today than yesterday...
That was mind boggling. I think it was Chris Brown (smartfootball) that pointed out during the Baylor/Texas game that Baylor when they lost all their qbs adjusted to an old single wing and made the best of what they had, and mentioned the Ryan Lindley debacle as a counterexample of just stubbornly attempting to the do the same thing with a piece that won't work.
Isn't there some rule that says he won't be able to play on a practice squad now that he has been signed to a second roster?
He was already on Miami active roster Earlier this year.
Woof, that mustache-only look needs to go...
Come on up to Cincy Logan! His baby momma is from here, but he has an easier path to start behind Tannehill than Dalton