Because it's very unusual for a team to win 10 matches in succession especially in this division.
Unusual set of playing conditions too though isn't it.
I'd be willing to bet the top 3 in the division have never all won there last 7 remaining games, nor has it ever even looked like it was likely happen. However at present it looks like it just may.
I find it hard to believe behind closed doors isn't playing a big part in that since none of us are particularly stellar, but it does make it hard to rely on what would normally be true in under the usual circumstances.