Having 6 carriers then they'd have the capability to maintain a smoother turnover cycle (on duty-maintenace-training) while having 2 carriers on duty at any one time, but by then Liaoning will be in a situation that it can no longer serves as dedicated training vessel anymore, as by then the PLAN already moved on to CATOBAR operation. Thus it'd be interesting as to what will they do with it.
I've always maintained the belief that it is misleading to think of Liaoning as a dedicated training vessel or a dedicated training carrier.
Rather, I think it is far more accurate to say that it is the Chinese Navy's "seed carrier". This means it is meant to initially operate as a carrier whose primary mission is to train and familiarize as many crew and pilots as possible with most aspects of carrier operations, and to allow the Navy to develop operating procedures and doctrine. During this early stage, the Navy will likely only have Liaoning in service (i.e.: the present), and will maintain the ability to be deployed for combat operations if urgently required but would not be sent for such missions normally.
Later on, once more carriers enter service such as 001A and 002, Liaoning should have familiarized and trained enough crew and pilots to allow the Navy to more confidently operate multiple carriers in a more regular way where they no longer need a seed platform to develop the key knowledge and initial procedures and doctrine, and by then Liaoning will probably operate as a standard carrier as it was always meant to be.
I think a good comparison for Liaoning's seed role is the initial two 052C class destroyers -- they were the Chinese Navy's first aegis type warships and likely provided an immense advancement in capability over previous combatant classes.
There was also a significant gap in construction between the first pair of 052Cs and the subsequent four 052Cs and eventual 052Ds -- part of this reason was likely because JN's move to a new greenfield shipyard, but another contributing reason was likely because the Navy wanted some time to familiarize itself with the new capabilities of the 052C, work out the kinks, and to develop doctrines and procedures for operating such a warship and to get as many crew aboard the 052C so they can adequately crew future larger numbers of aegis type warships.
Of course, as more 052Cs and 052Ds have entered service, DDG 170 and DDG 171 have now become regular destroyers in the Navy's overall order of battle, having fulfilled their early seed role as the Navy's only first two aegis type warships.