Thank you very much for your curiosity. Regarding the trip route; as my experience since 2000, the Chola Pass (5,320m) trek is much easier from the Gokyo side. I mean if there is more snow or ice on the trail to the pass, from Gokyo the steep descending part is less than from the EBC side. So, I put the trip itinerary from Gokyo first. But this is the only view of my experience; it might be dissimilar to individual trekkers. As Mt. Everest (8,848m) is top of the world, and most of the trekkers are curious to visit Mt. Everest Base Camp at first. And another thing, according to following days weather and trail circumstances you can change the trekking route after Namche Bazaar.