I see this is your first post so Welcome to the forum!

You say you verified that you have spark and fuel? Then it maybe compression is what you're missing, remember to disconnect the thing ontop of the motor that lifts the valves or you won't get a compression test.

I have seen head plugs leak but it shouldn't give you a no start issue.

Also check for fuel in you oil, maybe be a bad petcock

Can you share a pic of the oil leak?

The head plug leak will be most noticeable in the cavity next to the exhaust port.  Look in that cavity and see if there is wet oil in there.  Unless the plug has completely popped out, the usual nuance leak should not cause a no start condition (unless you’ve completely run out of oil).

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1099227295

The head to head cover uses sealant (no gasket).  That can leak.  And the head cover bolt that protrudes into spark plug area can leak.  Suzuki bored the hole a little too deep.

Sounds like a fuel delivery issue to me.  Do you have a stock OEM petcock valve?  Try putting it on prime and make sure you have at least 1 gallon of fuel in the tank.  Put it on prime, remove the fuel line at the valve or carb, and see if gas pours out.  It should flow pretty good.  If you have a weak stream, replace the petcock valve or talk to your urologist.  

Perhaps too obvious, but did you accidentally bump the kill switch and turn it off?  I’ve felt foolish doing that before.

You may also want to check the clutch safety position sensor and side stand sensor.  Worth a shot before digging into other things.