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a) I think for the landing they will use a different tower from the launch tower. Launch tower has fuel/oxygen lines and in general is not well suited for landing catching role.

b) I would imagine landing tower(s) as lightweght specialized structure that can move relatively fast to catch a rocket within +/- couple meters of ideal landing center.

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It's my understanding that the purpose of landing at the launch tower like this is to reduce refurbishment time rather than to lower weight from the legs - their stated goal is being able to re-launch in under an hour after landing. Having a second landing lower would add similar delay to simply landing at a pad.

That's an interesting idea. A landing tower, built to refurb the first stage before wheeling it back over to the launch tower for refueling and then another launch.

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