Hey my friend, I can understand the logic of what you are thinking for a lineup for sure! I will say though, that with what you have now, you will need a 2013 or 2012 Mori (older one) anyways to have them all in correct order since you have a 2013 Yellow House which are very rare.
Depending on how someone is doing their lineups, older Moris are more valuable for sure to collectors since it makes it easier to get them all in correct order!
If you are still interested in trading my dear & sweet friend, I'll send one of my 2017 ones your way as soon as I receive the 2014 one from you!
I completely understand though if you want to think about it more and no worries about any hard feelings because I want to make sure my friend is happy!
Look forward to hearing back from you soon my dear & sweet friend!