Thank you for the reply, gamarin.
About the question 3, 4.
I want to build a Dapp that includes a node which is able to switch to the full-node or the LCD dynamically. And let’s say I made the Dapp and deployed it to the end users and if some user’s resources are not enough to handle the full-node then it has to be switched to the LCD automatically. Moreover, As far as I know Tendermint’s max validators are 100 at the beginning. So, if there are 100 validators are running already with the full-node, then the 101th Dapp, the same, has to be switched to the LCD automatically. So, here’s my curiosity, is it able to build this kind of fully distributed app with current Cosmos-sdk?