Hello again Jim, thought you fell off the earth.....although I should talk.
I'm not sure I understand your question, so I'll explain what I think you're asking clarity on.
On the movement from the NS to RR. It could be a transfer because of casualties taken or it could be something as simple as him wanting to go. He may have had a chum or two in the Regina Rifles and wanted to fight with them. They trained in Debert before going overseas and the friendships may go back to there. I know personally of a few times were that is the case.
The sailing dates seem normal to me.
He left Halifax by ship on April 6/44 and arrived in the UK April 12/44. (approximately 6 days at sea)
He was in the UK from April 12/44 to June 12/44, most likely spent the time there training and re-equipping at Hiltingbury Common, six miles north of Southampton. This camp was one of many such establishments in the area operated by Movement Control.
He left the UK by ship (probably Portsmouth, England) June 11/44 and arrived in Normandy, France the next day (approximately 110 miles) June 12/44. From that day to July 8/44 it would have been a mixture of dirt, lead and Calvados.
Did I miss something?