Uptick, I believe they are and we are going to see a big push real soon. In this article, notice the difference between MM's as to whether they are a wholesaler, retailer, retail/ECN, or ECN.
The market maker is using ECN's to actually mask his own intentions or what appears to be happening when really it's the opposite. The MM is really selling the short shares to himself through other MM's, the reason why it's buy time as they are buying not selling. Be prepared for for an upswing as the MM's shorted shares are being covered by shorted shares or as they like to put it "loaned"
Either way, their going to make the push eventually and Move and Make the Market.
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