''So why would I need a 12v relay to power up the starter
solenoid?''
The little relay requires very little current to operate vs. the much larger starter solenoid.
Therefore the little relay will operate even if the ""Start'' circuit from the ignition switch though the safety switches to the starter solenoid has degraded over time. Not to mention it was marginal in the first place.
When the little relay activates it completes a much shorter circuit (with less voltage drop) from the battery cable terminal on the solenoid to the ''coil'' terminal on the solenoid to ensure the starter engages.
You are not the only person to have had the ''starts, sometimes'' issue, the folks at John Deere realized it was a problem and produced a kit to solve it.
But the solution is so simple it can be replicated with a salvaged ''ice cube'' relay and a little wire and a few terminals for very little $.
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