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wan connection flows

Based on the diagram attached,

Cisco 3845 are dual hub routers , connected to a NON-CISCO accelerator/QOS device ( pardon for using cisco logo )
Lines drawn are physical connections between these devices as well as towards the Site-1.
Routers /switches at hub are connected directly as well as via the non-cisco device interconnect.

If there is a new site added to this network in similar manner as what site-1 is connected to hub, all traffic
communication between these ( existing and new ) will be passing through the hub before reaching other site destination,
is there a connection flow issue seen here?
I was told by some that the QOS/accelerator device would probably see multiple flows ( or times ) for a single
connection between site to site.the device is probably layer2 only.

I couldnt understand this properly.Appreciate if anyone can help me understand the logic & a possible alternative.

Thanks in advance.

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