It seems that in the first draw of express entry only few NOCs were selected.
So, it means that in Express Entry system they will be conducted draws based on NOCs. Read below official news of the CIC:-
"First round of Express Entry candidates invited to fill labour market needs and contribute to Canada's economic growth
February 2, 2015 - Ottawa -Canada's Citizenship and Immigration Minister Chris Alexander today announced that the first round of top-ranked candidates from Canada's Express Entry system is already helping to fill demonstrated and verifiable gaps in Canada's labour market.
On Saturday, January 31, 779 skilled workers, including professionals in natural and applied sciences, and industrial, electrical and construction trades, were invited to apply for permanent residency in Canada. Each of these candidates declared that they already have a valid job offer or provincial nomination. "
Regards,George,
Doha,Qatar