'Streeter's Choice' was a pretty expensive plant & it would probably not be around as a noid … even if your friend was very generous. I think that whoever owned one of the plants would make sure that it was very accurately labeled.
'SC' would not look somewhat like the photo. It would pretty much look exactly like it. It might be that you have the regular form of C loddigesii.
when it blooms i'll post pics up. the place I got it from has a big inventory of orchids. he just handed me a catt and said ''here take this one, I don't know what it is'' it bloomed for me. just like yours, it was flat faced, lavender colored flowers, fragrant, not a big growing catt about 7'' in height, bi folate and uni folate growths.