I'm confused on 1.9 | plz help

BoghieWanKanobie, on Apr 22 2020 - 14:10, said: KRZYBooP,   I am in favor of this change as noted above.   However, this chap researched and bought the first three (Tier II - Tier IV) of the 1.8 version Japanese Heavy line and was currently researching the modules for the fourth (the Tier V O-I Experimental).  Now, those four tanks are gone and he has not researched the Tier VI O-I.  He does not have the Tier II - Tier IV Japanese mediums and obviously does not have the Tier V Chi-Nu Japanese medium partially researched.   His question is:  Does he have to research the Tier II - Tier V Japanese mediums?   My understanding is that he got blueprints for the heavy line he completed so he could use those to get to the Tier V Chi-Nu medium.  I am not certain though.