The ranking system has a ranking threshold, it takes many ‘contributors’ into calculation. Rounds won, MVPs earned, total damage, bomb plants, etc. the complete list is non-disclosed to the public as Valve is promoting people to put their attention to playing the game than to be concerned about an ‘true’ number. Essentially when you earn rank on an alt. account it is calculated on an average, and yes, even prior casual stats are used to do the calculation. I have seen a player go straight to DMG, only to drop 2 ranks on one loss to MG2 as the calculation was updated.
This is why you will see so many alt accounts on MGE, DMG, LE, LEM with only 25-30 competition wins. See where you will be ranked by the time you have 50 wins.
yea i know, its just frustrating battling to get out of N4 on my main and then win one game with my alt and go straight to MG1 lol

