@picklericky1337 

Sorry to bump back the question,  but plz try to answer these 

1 )   Why do you want to keep your current router ? 

2 )   What do you need of functionality of that router the ER605 might not do ?

3 )  You already have  (TL-SG2008P) with OC200, two eap245 v3, poe ip camera, and an unmanaged switch for my media cabinet, so why not just at a ER605 ?

biggest plus is you can easily set the settings and things you want ,   setting Vlan's (split your camera's from IOT etc... ) , DHCP ( fixed ip's ) etc.. its all integrated , restrictions  , routing , FW ( although limited ) ,  if you have a managed switch in 1 location and 1 in another ,  you can easily handle the vlan's etc... while still trunking the vlans over 1 cable and then split in your cabinet. 

for me ,  the router was less then 10 % of the investment I did in the omada setup when I made the plunge ,  sure I probably could just keep my router to 'route'

it didn't seem to make sense.