Two further points.
"John Devoy"
Devoy was an Irish exile living in New York, a newspaper editor and fund-raiser.
He conspired with Casement to raise money to obtain weapons for the Rising, nothing more – he wasn't a policy-maker and neither he nor Casement had a voice in the Rebellion.
At no time were either of them part of the planning of the Rising, so whatever opinions they had of Germany were theirs, not the Rebel leaders - neither were spokesmen for the Rising.
At no time has it been shown that the Rebels ever colluded with "the enemy" or showed any sign of active support, apart from accepting weapons, despite efforts to show otherwise and such claims have long been rejected as contemporary attempts to smear the Rising.
"The enemy"
Germany was not Ireland's "enemy" as far as the rebels were concerned they had made it clear that they did not take sides in the war, as far as they were concerned it was a struggle for power between Empires, one of which Ireland had fought for centuries to free herself from.
The Rebels fought under Connolly's slogan, "we serve neither King nor Kaiser, but Ireland".
The British authorities worked hard at trying to prove the Rebels sided with Germany, they found nothing, it was an attempt so smear then as it is now.
You want to prove it – do so with something more than archaic accusations   
Jim Carroll