I disagree. Pine is a like for like replacement for gopherwood. The IM situation isn't. A fair analogy might be using someone else's voice to sing instead of your own or even playing instruments instead of singing. I don't know anyone that tries to make a case for either.
The following quote I think clearly puts forth the issue in relation to the gopher wood question, and states what I did, but far more clearly. Note the sentences about substituting and adding.
"A person is correct in teaching that it would have been sinful for Noah to have built the whole ark or a part of the ark out of non-gopher wood. But the sinfulness has nothing to do with the fact that the non-gopherwood has a specific to specific relationship to gopher wood, under the same generic
wood. It is thus not due to "to specify is to exclude". Rather, the sinfulness is due to the absence of authority (the absence of an affirmation) for the non-gopher wood. It was sinful to use non-gopher wood because God nowhere authorized non-gopher wood. This lack of authority is of two kinds: One kind forbade
substituting non-gopher wood for gopher wood, and the other kind forbade
adding non-gopher wood to the gopher wood. Let's talk about these in turn.
First the
requirement to use gopher wood forbade
substituting non-gopher wood for the gopher wood. To require is to forbid anything that prevents the requirement. (
To require is thus to forbid, not to specify is to forbid, unless by specify
- and here is the exception the reference is to a
required specific. But even here it's the requirement not the specificity that is forbidding the substitution.) So building the
whole ark out of non-gopher wood would have been wrong, because it substitutes and thus would have prevented doing the divine requirement. A requirement implicitly forbids anything that is substituted for it. So it is correct to say "To require is to forbid substitution." But what about additions, where you still have gopher wood, but you are including non-gopher wood? With a substitution you do not have the gopher wood at all. But with an addition, you have gopher wood plus something else. Additions are not forbidden by the
requirement (which only forbids substitutions) but by the silence.
Let us now turn to this second kind of the unauthorized. There was silence about using non-gopher wood, So building even
some of the ark out of non-gopher wood was sinful, because God's silence forbids as we have shown in earlier chapters. Therefore,
adding some wood to the gopher wood would also have been wrong. It was silence, and thus the lack of divine authority for adding any other kind of wood, which forbade any other kind of wood." George F Beals
How Implication Binds and Silence Forbids p199
If silence does not prohibit, then it would be perfectly reasonable to use other woods
as well as gopher wood. If Noah used pine
as well as gopher wood, he could quite rightly say to God "I have fulfilled your command, I have used gopherwood". All Noah would have to do was make sure he used some gopherwood when building the ark. If God were to ask Noah "Did you use gopherwood to build the ark?" Noah could say "Yes".
Refrus