last @krofax comments

Author: qbzzt

pages/interop/estimate-costs.mdx

@@ -36,8 +36,6 @@ There are several factors that determine the cost of an [interop transaction](/i
     You can either use [`CrossL2Inbox`](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/src/L2/CrossL2Inbox.sol) directly, or use the cross domain messenger, [`L2ToL2CrossDomainMessenger`](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/src/L2/L2ToL2CrossDomainMessenger.sol), which uses `CrossL2Inbox` internally.
 *   The transaction type.
     Every interop message has two transactions, an [initiating message](/interop/message-passing#initiating-message) in a transaction to the source chain, and an [executing message](/interop/message-passing#executing-message) in the destination chain.
-*   Whether autorelay is turned on.
-When enabled for a specific chain, the `L2ToL2CrossDomainMessenger` still executes a message, but the chain operator covers the execution costs.
 
 ## CrossL2Inbox
 
@@ -73,7 +71,7 @@ Where:
 *   `n` = number of data bytes in the log entry
 
 Every transaction posted costs at least *21,000* gas.
-In comparison, the hashing operation costs approximately [*30+0.2×\<number of bytes>*](https://www.evm.codes/?fork=cancun#20), which is negligible by comparison.
+The hashing operation costs approximately [*30+0.2×\<number of bytes>*](https://www.evm.codes/?fork=cancun#20), which is negligible by comparison.
 We can usually ignore the [memory expansion cost](https://www.evm.codes/about#memoryexpansion), unless the validating contract uses a really large amount of memory.
 
 The cost of using the message is beyond the scope here, because it depends on your application.
@@ -94,8 +92,8 @@ This would typically be written to previously empty storage, so the cost is *22,
 Then it [increments the nonce value](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/src/L2/L2ToL2CrossDomainMessenger.sol#L158).
 Overwriting previously used storage (which means storage where the present value is *not* zero) only costs *5,000* gas.
 
-So, the initiating message costs a little over *27,100* gas, plus the negligible cost of emitting the log message, a few if statements, etc.
-Of course, it is created as part of a transaction, so we might want to include the *21,000* transaction cost too.
+Hence, the gas cost for creating an initiating message is approximately *27,100* gas, plus minor overhead for log emission and contract operations.
+Note that this estimate excludes the 21,000 gas base transaction cost, which applies to all transactions.
 
 ### Executing message