Shooter Game - AShooterWeapon::MyPawn replication

Development Programming & Scripting Multiplayer & Networking
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In Shooter Game, AShooterWeapon::MyPawn is replicated using the following:

Header:

UPROPERTY(Transient, ReplicatedUsing=OnRep_MyPawn)
class AShooterCharacter* MyPawn;

UFUNCTION()
void OnRep_MyPawn();

cpp:

void AShooterWeapon::OnRep_MyPawn()
{
	if (MyPawn)
	{
		OnEnterInventory(MyPawn);
	}
	else
	{
		OnLeaveInventory();
	}
}

void AShooterWeapon::OnEnterInventory(AShooterCharacter* NewOwner)
{
	SetOwningPawn(NewOwner);
}

void AShooterWeapon::SetOwningPawn(AShooterCharacter* NewOwner)
{
	if (MyPawn != NewOwner)
	{
		SetInstigator(NewOwner);
		MyPawn = NewOwner;
		// net owner for RPC calls
		SetOwner(NewOwner);
	}	
}

I would like to ask for an explanation of the logic of calling OnEnterInventory in OnRep_MyPawn. The RepNotify function is only called when MyPawn has already been changed, right? So my understanding is that OnEnterInventory will call SetOwningPawn which will check if (MyPawn != NewOwner) which will always evaluate to false because MyPawn has already been replicated, and hence nothing will be done.

What is the point of doing this? Or is my understanding wrong?