I suspect the delays are for something other than MGB .
according to DND website number 801 an 802 are flying in West Palm Beach.
"The base commander explained that the helicopter is heavier than originally expected, and as a result fuel is consumed more quickly"
I would expect that the range is the biggest issue at the moment.
What is the percieved threat that this machine will protect us from ? , the world has changed since the original rfp , maybe they could buy 5Billion dollars woth of Robbies and just discard them after each mission. ( Pilots could swim back to ship )