Does BEC mandatory for the sarvo with Pixhawk 4?

I am trying to control the automatic landing gear of the frame using the Pixhawk 4 controller. According to the documentation, I have to power the FMU on the power management using BEC 5 volt. Could I use one of the two CAP&ADC-in pins powered 5 volt instead of the BEC to power the FMU? If not what is the purpose of the BEC exactly?

Answered in Slack here: Slack

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