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If someone leaves a top-level LGTM/accepts your PR using Github but also leaves line comments, you can assume all line comments are in the satisfied disposition, even if the Reviewable toggle hasn't been set as such. If you disagree with any of their feedback, you should still let them know (e.g., "actually, I think my way is better because reasons"), but you don't need to wait to hear back from them to merge.
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To merge code into any CockroachDB repository, you need at least one LGTM (or Github PR approval). Some LGTMs matter more than others; you want to make sure you solicit an LGTM from whoever "owns" the code you're touching.
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