While I of all people should not be saying this.. CH120 on Lightning LDrago is probably in most instances
better than BD145. If BD145 stays up, CH120 by all means should too: It is way more versatile, 120 is an absolutely terrific height. It has no problems with 230 variants (if you insist, you could use 145 height but 120 does the job damn well without the change) and 170,195,220 are much less awkward for Lightning LDrago 120 while for BD145/145's in general it is complete hell. I don't know why that is, but it is. Not to mention low track stamina/defense are difficult to KO with BD145 while CH120 would deal with it easily.
The argument about how BD145 does better against attackers is correct, but in some places (Though I've only been to a single full tournament, it is unbearably obvious) including Toronto attackers are barely used making that advantage of BD145 non-existant. Far more low track stamina here than attack which makes something like MF Lightning LDrago BD145LRF extremely hard to use well. Again, CH120 can just wipe the floor with it.
I could give you more but those are the most solid points I can think of to keep CH120 on Lightning if BD145 is.