Most likely not; however, if you're not going after a specific legendary/exotic or trying to get a better roll, I would recommend stashing legendary and exotic engrams regardless as you'll rank up the Cryptarch faster once the DLC drops and could *potentially* have a chance to get newer gear from the rank up packages.
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Legendaries before exotics. The chance of getting a legendary engram from a rank up package is low. But buying an engram from the Cryptarch is a near guarantee. Exotics dont break down into legendary marks, legendaries do (at the cost of SOME Cryptarch rep gains)
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Very true, good point.