@GAQS808 the Meraki wireless APs absolutely do not need the Meraki switch.
We initially replaced all of our controlled managed APs with Meraki cloud managed ones while retaining traditional Cisco PoE switches. We then replaced a load of Cisco ASAs and routers with Meraki MXs, most recently we have replaced a number of traditional Cisco switches with Meraki ones, starting at the network edges and working towards the core.
As long as you understand the difference in the way spanning tree can be managed and make sure you use compatible options on trunk links between switches then you can mix and match all you like.
Personally I'd keep the Meraki switch if you can use it as it will give you more visibility into your network traffic.
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