A margin of 1,400 + low voter turnout isn't enough to handover power. We don't know what the majority of Kenyans want because they obviously don't feel represented. Ruto needed to have had 60% or above votes with a large voter turnout for the incumbent to comfortably handover the reigns of power.
Such a small margin to win is ok for an incumbent but not for an outside coalition. Especially one with a spotty track record spearheaded by a leader already declared unfit for office by the incumbent.
Ruto waltzing around stealing MPs is hostile, strengthens the assertion that he's reckless and unfit for office. I'm sure constituents are angry that their beloved MPs switched sides just like that, spitting at their votes.
If elections are held again, those MPs don't deserve to lead their constituents. I'm sure voters will come out in numbers to punish those MPs now with KK.
Now would be a good chance for Ruto to demonstrate to the world that he's not just a power hungry nutcase with a Messiah complex with the potential to destabilise the region, but can actually negotiate with powerful people (be it 'dynasties') and does possess soft power diplomatic skills to run an office.