Sure, we've all heard many of these. And in every case, you can hear the similarity. ...That's not the situation here. The Courage Commander stuff doesn't sound similar to Steiner's Marlena theme, and doesn't have reference points.
Speak for yourself. I hear a very clear similarity. Different people's perceptions work differently. Some people's brains latch more onto patterns, others more onto specific sounds, etc. So two things that seem dissimilar to one person can seem very similar to another.
Let's try this... I'm going to compare the notes of the two basic motifs, starting them both on C for the sake of comparison.
Steiner Romulan motif: C - C# - C - D# - C - F - C
Courage Commander motif: C - C# - C - C# - B - C# - C
That's two 7-note phrases with the same first three notes and the same last note -- 4 identical notes out of 7, more than half the phrase. Three notes differ, but follow the same pattern of up-down-up. Then, in both cases, notes 2 through 7 repeat (or approximately repeat) at least two more times. And in both cases, notes 1 and 7 are sustained longer than any of the other notes, although the actual lengths of the notes are different.
So I see a good deal of similarity between the two. Plus the similarity that they were both written for Romulans. Coincidence? Sure, maybe. But maybe not
. All I'm saying is maybe, and I don't know why you're so hostile to a simple maybe.