The issue is before court of appeal. I think matters presidential - the returning officer is clearly chebukati - he is the one to tally up the results and announce the winner. Governors & Senate the RO is the County Managers. Whether RO has the power to alter results received - either from presiding officer in the polling station or RO or County RO (for senate, governor, woman rep) or president - is big question. I don't think RO should be restricted to just announcing results - even when there are clear mistakes made by those bellow them - mathematical or otherwise. There should be a log on why the results were altered or even rejected- say you noticed a mathematical error or cast votes are more than registered votes.
The question is upon what basis would a person in Nairobi purport to "correct" a result from Turkana? What information would he be having that is not available to the RO.
Then there is the lamest of excuses you come up with: Mathematical Error. This time is not a "Computer Error" worth billions to fill up the campaign chest!
I tell you what? If arithmetic is a general problem among the Kikuyu and Kalenjin (who represent 90% of the election officials), why not open it for diversity so other tribes not debilitated by this most unique distemper can even out the errors if not eliminate them? Are you kidding me or what? Is that the excuse to be used this time? That a man employed ostensibly because he has a degree or two and years of experience cannot count?
Here is how it works: Arithmetic errors are detected as the results are discussed with agents and polling officers. Once they are sorted out, the RO mounts the platform and announces the final polished product. It is the result of the wishes of the specific constituency to be transmitted to Nairobi to Chebukati.
Like the Constituency RO, who collected results from polling stations, his is to collect and tally constituency results. If there are arithmetic errors after announcement, he cannot purport to "correct" them. That is already part of the issues to be adjudicated by the courts. By the act of appending his signature to the result, he ceases to have any more power over the result.
Chebukati cannot assume that power.