@DingerX
First, he reported that the Tower offered 16C; in fact, as you can hear from the recording posted above, AS27 requested the side-step.
Can you explain how you come to this conclusion?
Transcript (my own) from the LiveATC recording linked in post 32.
26:34 TWR: "Alaska 27, Seattle Tower, Wind 1-1-0 at 8, Runway 1-6 Right, cleared to land."
26:38 AS27: "Alaska 27, Cleared to land, 1-6 Right."
28:16 TWR: "Alaska 27, if you have the field in sight and would like the Center, it's available."
28:22 AS27: "Alaska 27, Ah...roger, thank you! We'll take, uhh, 1-6 Center."
28:25 TWR: "Alaska 27, Change to runway 1-6 Center; cleared visual approach 1-6 Center, cleared to land."
28:29 AS27: "Alaska 27, cleared visual approach 1-6 Center, cleared to land."
Where do you hear AS27 "request" 16C, before ATC raises the subject - i.e.
offers the change? AS27's voice tone expresses surprise at the idea.