No need to go thru the lobby of CR. I highlighted your walk from the CR dock in yellow.
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The #1 is where you walk under the bridge between CR and BLT.
The #2 is where the Security check-point will be (usually few people, low stress) somewhere along this stretch.
The #3 is where the MK turnstiles will hold you until they begin releasing people onto Main Street a few minutes before 8am.
The #4 is the point to queue up once you are at the Hub for the controlled walk to 7DMT. The Welcome Show in front of the castle starts a minute or two before 9am and is very brief. Cast Members (several of them) stretch a rope and walk carrying it up toward the Tea Cups and people follow politely behind. Up around the Tea Cups they coil the rope and let you make the last 50 ft on your own.
This is the opening procedure for when there is no morning Extra Magic Hours (in other words, for a true 9am open). When the morning EMH is in place for an 8am open, once through the turnstiles you have full access to all the Lands (no Welcome Show). Only for the regular 9am open do they hold you at the hub and do the Welcome Show.
Bama Ed