Isn't it strange that Hal Finney mined a block number 70 or so, only 20 hours after the first public mineable block ?

Blocks in the 70-80 range are the ones with lowest work in the whole block chain history.

So either:

1. Many people started mining right from the start: Satoshi is a group of people. Hal PC mining did not affect the overall hashing power by much.

2. Hal is lying.

3. I'm mistaken. How?