There is a Light Blue with orange stripe wire used for Fuel Pump relay, it is spliced and also goes to OBD I connector
very odd that 4 people can't get an engine started???
Assuming compression is OK or reasonable and if the starter motor is turning the engine over then spray some starting fluid into the intake, or add some gasoline to intake.
If engine starts then dies you have no fuel coming from injectors
If engine doesn't fire then you have no spark
Pull out a spark plug if it is wet with fuel then you may have a fuel leak into the intake.
Burned up Cat would mean a leaking fuel injector or leaking Fuel pressure regulator(fuel is sucked into the intake)
Rich running cause Cat to get very hot trying to burn up the extra gasoline in the exhaust.
Also remove O2 sensor from exhaust pipe, you may have a blocked exhaust, i.e. potato in the tail pipe, this will prevent engine from starting, O2 sensor hole will allow start up.