Kifyatu Sorry to say that your fears are baseless. I believe that the President does not rule alone, he is a part of a bureaucracy, and there is a certain way that he must conduct his business in line with the ruling party/coalition's policies (in this case the UKAWA coalition).
But i don't blame you. By the 1977 constitution the President is this very powerful majestic person who is almost a 'god among mortals'. That is the president that Tanzanians have known for over 50 years now.
UKAWA has promised to change that by implementing the katiba ya wananchi. Lowassa will rule by that katiba; not the 1977 one or the one Chenge and his goons passed. There are many checks on the presidential powers and clear demarcations of jurisdictions of the executive and legislative branches of government. Parliament will be fearless in rebuking the executive and vice versa.
Lastly, please bear in mind that this election carries with it the fate of the nation for half a century or more to come. CCM's victory will be the victory of CCM's katiba.