You should have a standard expectation that results of live trading are going to be significantly worse then your back test results.
No doubt, and if his models revolve around smaller capacity instruments you can subtract 1/2 the potential. It's hard to build a good forecasting model around retracements, so he should plan on chasing breakouts above offer. Basically bending over backwards on a daily basis, or get bombarded with unfilled orders.
I know quantopian only allows equities and 1 min historical data. Do you know if this link provides lower granular data and futures market?