If a person who is neither an MLA nor an MLC, cam become the Chief Minister of the State. But he should get elected as MLA or MLC within six months from the date of becoming the CM. He may be a very good leader and maybe doing a very good job he can't be CM even a day more than 6 months.
Even an elected MLA also has to resign from his CM post if his party wants him to resign. In this Uttarakhand case, I think that his party high command wants to change the CM of the stats and asked him to resign. It is not a problem of coordination between the central government and the Election Commission, I feel.
K Mohan @ Moga
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease