Meaning of 「これはこれで」, and the difference between it and 「それはそれとして」


I came across the following lines.

> ・・・俺としては、下駄箱の中に手紙が入っているみたいなほうが好みだった。でも **これはこれで** 、少なくとも相手が積極的だってことはわかる。

I am wondering about **the meaning of 「これはこれで」** here. As one might expect, it
does not have any entries in the dictionaries that I use. However, it seems to
me to mean something along the lines of "that aside".

If this is the case, what would be **the difference between 「これはこれで」 and the
「それはそれとして」** below?

> ・・・まあ、 **それはそれとして** 、正解の答えがわかっても、どうすればあの「sprachgefühl」が身につけられるかという問題が残っています。

They both appear to have similar meanings.

Or would the sentence perhaps be better interpreted as such?

> [これは] [これで少なくとも {相手が積極的だ} ってことはわかる]。




それはそれ **として** means "that aside, ..." "apart form that, ..."  
Compare:  
これはこれとして "that aside, ..." "setting this apart, ..." "apart from this, ..."

The これはこれ **で** (≒ (これは)これ **なりに** ) here means "This (is good/okay, etc.) in
its own way."  
Compare:  
それはそれで/(それは)それなりに = "That (is good/okay etc.) in its own way."  
彼は彼で/(彼は)彼なりに = "He (is trying hard / doing his best, etc.) in his own way."

I would parse your sentence this way:

> [これはこれで][少なくとも{「相手が積極的だ」ってことは}]わかる。




それはそれ **として** means "that aside, ..." "apart form that, ..."  
Compare:  
これはこれとして "that aside, ..." "setting this apart, ..." "apart from this, ..."

The これはこれ **で** (≒ (これは)これ **なりに** ) here means "This (is good/okay, etc.) in
its own way."  
Compare:  
それはそれで/(それは)それなりに = "That (is good/okay etc.) in its own way."  
彼は彼で/(彼は)彼なりに = "He (is trying hard / doing his best, etc.) in his own way."

I would parse your sentence this way:

> [これはこれで][少なくとも{「相手が積極的だ」ってことは}]わかる。

