Genesis 1 gap theory

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Whereas I see no gap in the seventy weeks of Daniel in Daniel 9, I believe there are instances where gaps are to be understood in scripture. Perhaps Gen 1:1-2 is one of them.

Please help me narrow this down to its truth.

Genesis 1:1 says God created the heaven and earth. And verse 2 says the earth was void and without form.

Genesis 1:1-2 In the beginning God created the heaven and the earth. (2) And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.

When you research the Hebrew word for "without form" it is as follows:

tohuw {to'-hoo} from an unused root meaning to lie waste
- wasteland, wilderness (of solitary places) - place of chaos

H8414
תּהוּ
tôhû
to'-hoo
From an unused root meaning to lie waste; a desolation (of surface), that is, desert; figuratively a worthless thing; adverbially in vain: - confusion, empty place, without form, nothing, (thing of) nought, vain, vanity, waste, wilderness.

The same word is used in Isaiah 45, translated as "in vain", and is also used in connection with the creation of earth.

Isai 45:18 For thus saith the LORD that created the heavens; God himself that formed the earth and made it; he hath established it, he created it not in vain (TOHUW), he formed it to be inhabited: I am the LORD; and there is none else.

So if Isaiah said God did not create the earth TOHUW, but Gen 1:2 says the earth was TOHUW, then how can we make any sense out of it other than saying a gap of time occurred after creation in Genesis 1:1 and before verse 2 when the earth was TOHUW?