Why is lower rad hose a higher temp?

[mosel70]

'70 C10, 402. I have all new cooling system components to include Summit's water pump SUM-312461
Water Pump, Mechanical, High-Volume, Iron, Natural, Chevy, Big Block, Long, Each

I've noticed my upper rad hose from T-stat to upper/drivers side rad is 10-20 degrees cooler than the lower/pass side hose to water pump.

Q. Does that mean coolant is flowing OUT of the water pump to the rad and is the more accurate temp?