>
> 1) Am I trying to achieve this the correct way?
>

Probably not.  If you use value updater to communicate a change to your data 
provider, then data provider can update itself, which will automatically 
update all attached displays.
Take a look at this 
post<https://groups.google.com/forum/#!msg/google-web-toolkit/yeNZX9o6G_s/zBtaNxGsyG0J>.
 
 One difference is instead of RPC calls your provider would get the data 
from the valueUpdater.

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