What is your source for #2? Only a single market on the darknet currently accepts Monero (libertas). Monero currently lacks any multi-sig capabilities so it is useless for the newer distributed DNM systems such as openbazaar. At most Monero is used to obscure the trail of bitcoin as someone will buy some Monero with bitcoins puchased from a site like Coinbase and then sell those Monero back for bitcoin to avoid Coinbase banning their account for transferring to a known DNM Bitcoin address. Bitcoin is still used for the vast majority of DNM transactions.
