There is no objection to discussing a pairing that you can justify; the cough was to ensure that the discussion didn't take a leap off the path of sense.
But love always requires a leap!
In all seriousness-
Here is my reasoning as to why Marigold and Marten are a suitable couple.
The first basic block of compatibility- Physicality
Marten- we haven't seen him show the level of vanity that requires a "certain type" of person for attractivity- we've seen Marten fall for both the short, voluptuous type AND the tall, physically intimidating type. Marigold is not "ugly" (as we've seen previously, she can be very attractive when she puts the effort into it).
Marigold- When it comes to body types, we've seen the Marigold falls very easily for the "not body builder" type- I present as an example of this Angus, who mirrors Marten in body type (different head though).
So first level of compatibility- check
Second level of compatibility- Emotionality
Marten- he's already gone through two (three?) bouts of dealing with Alpha Women, and he's been burned. Emotionally, at this point his next relationship may not require a domineering personality, but instead focus on someone a little less domineering. More Dora-type personality relationships very well could result in more of the same heartache.
Marigold- though she's a submissive introvert, at the same time her and a domineering partner seems like it would just cause conflict. Emotionally, at this point someone who is patient, kind and more apt to talk things over rather than yell would be a good match for her.
So the first level of compatibility- check
Third level of compatibility- Common interests
Given that when Marten and Dora first started dating they had barely any common interests at all (besides Faye as a friend), there's a good starting point here. Both Marten and Marigold are creative type personalities with an interest in anthroPCs. Yes, there are things they don't share (Marten doesn't play WOW), but at the same time that's not a
bad thing, persay- in fact, it can be indeed good! Couples need separate interests, things that they can do apart from each other; the ability to enjoy separate things allows for the retention of individual sense of self while at the same time the common interests allow for the enjoyability of time spent together.
We've also seen that Marigold, when coaxed "out of her shell", can indeed enjoy a lot of the commonality the group enjoys. She may spend a lot of time by herself, but I wouldn't go so far as to interpret that as some have (that is, the level of emotional stunt)- sometimes individuals who are introverted are just shy.
My reasoning also might stem from a bit of projection (as I have seen others on here have done)- My own current marriage bears a very strong resemblance to a Marigold-Marten pairing, and it's been a very happy ten years so far...
So it's not just a matter of "here's two random people, let's toss them together", I've got some solid reasoning behind it.