Custom rules component execution
When you say "what he had fill in my custom registration form" do you mean that fc_home_city, fc_pin and fc_loan have equivalent fields on the user entity (probably called something like field_fc_home_city, etc)?

If so then I don't see why  you are trying to populate those fields with code.  One of the main advantages of the Rules framework is that you can can use the token selector system to pass in values nested into the objects you have to hand without having to write a line of code.

For example if you wanted to pass in the field_fc_home_city value of the current logged in user to the "Home city" field then you'd enter "account:field-fc-home-city" into that field and then every time it executes, that token will be replaced with the correct value for the current logged in user.

If it's not the logged in user you want to work with then so long as the component receives the user account as a parameter then you will be able to use the system to get the values from that user entity.

The javascript drilldown mechanism on the fields should help you get to the right token, otherwise you can press "Switch to direct input mode" and find the token in the "Replacement patterns" fieldset.

A good overview of how it works can be found here.