[DeanLag]

I think your condition code is missing something.
Lets assume the name field is field10 and it contains 'Mysterious'

Then your code is only doing
If Mysterious then
ALL THE STUFF WITH HTML HERE
Else
Mysterious2207
Endif

I think what you want to do is

<!-- If name field is not empty -->
<if condition="$post['field10'] !== (NULL)">
<!-- then display name -->
$post['field10']
BLA BLA
<else />
<!-- if name field is empty then display username markup-->
$post[musername]
</if>

I'm not sure about that and I don't really understand what you're really trying to do.
I don't know whats the value of an empty field. Is it '0'? So might want to know the default value for an empty field first D: