Hi @Sushanth S K ,
If you have dedicated management servers (like 3, 4 and 5) you need to exclude those from the "SQL Server Resource Pool" as the SQL MP related workflows will also be spread amongst those servers if they are part of the resource pool.
So, this means that it makes sense that you have only Server 1 and Server 2 in your SQL resource pool, as those two servers are used for agent monitoring...
Here are my favourite sources regarding ressource pools, which you might find intersting:
Understanding SCOM Resource Pools
Resource pool design considerations
How to manage resource pools
I hope I was able to answer you question.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)