Do I understand correctly? :
1) For the functioning of CME Bitcoin futures, there is no need to physically buy bitcoins.
2) Direct influence on bitcoin CME Bitcoin futures will not have.
1) Yes.
2) No. Futures contracts are often used as a hedging instrument so although there is no need to hold actual Bitcoins many market participants will. If the price of the futures got out of line with the spot price then there would be an arbitrage opportunity. This means that there is a feedback loop between the two markets and they each influence each other.