They had to do something, think about all the money they have left on the table by not making pro-rata investments in airbnb and dropbox. Not leading the rounds does seem to mitigate the signaling risk issue. imho it's a risky strategy if valuations get frothy. They may be making investments they might not be comfortable with to preserve their integrity.
Not just may, they definitely will be making investments they'd rather not because of signaling. They obviously think that's a worthwhile trade for the upside on the next Dropbox.
