yes you can. I upgraded incrementally as they were released and leaked...7000, 7022, 7048, 7057, 7068, 7077 and finally the RC 7100. Common advice is not to do upgrades but you will be fine I am almost sure of it. I recommend to go ahead and upgrade to 7077 then the RC.
You have to weigh the times though. Upgrades take a while longer than clean install. If you don't have too many apps or tweaks applied, then clean install the RC.