... erhm ... and who would you put in charge instead? ... aka 'switch' the armycommand?
... from 3rd army
Ruzsky the cunctator who almost had to bee forced by threat of dismissal (if not charge of treason) to help out 4th and 5th army with attacking the austrian wiiiide open flank due to his very personal ambition being the one capturing Lwiw
... from 4th army senile(?), at least by his tasks against by marching short of exhausted austrian 1st army grossly overstrained
von Saltza ?
... what I somehow doubt would have gone unnoticed - and unaccounted for - by the germans prewar given the ... oh-so 'capable' and 'speedy' infrastructral abilities of Russia in these regions.
May I remind that there actually WAS one single commander for russian 1st and 2nd army?
... which formed the "
Northwesetern Front" under the command of former Chief of the russian General Staff Yakov Zhilinsky whom the generals Rennekampff and Samsonov so willingly obeyed and followed?
However...
IMHO the only way how the russians might have been able to avoid a/the Tannenberg desaster would have been ... a VERY to completly different overal operational plan - aka no Plan 1912 - at all (Plan "A" was as useless as Plan "G").
But that would have needed in 1911/1912 a very different strategical/operational doctrinal thinking as was prevalent then. ... worldwide
Despite the russian had made the 'ultimate' experience of superiority of defense at that time in the war with japan its lessons nobody wanted to accept.