If Mrs. Guthrie had not turned up missing maybe but under the circumstances the blood appears to be evidence.
I think the family is wise to not touch the property even after release. For example not cleaning the blood, or staying in the home or even the guest house, not gathering there for any reason, until there is some resolution, imo.
If the blood was from a previous incident considering her home appears to be well kept I think it would have been cleaned up pretty quickly by either Mrs Guthrie, if we are to believe she’s fully able of taking care of her tasks, a house keeper, or her daughter who I presume would have been told I had a bloody spell on the front porch I got it stopped but it’s a mess out there.
The front door is used as evidenced by the package.
Also neighbors or friends stopping by she wouldn’t want blood and lots of it out there since she seemed tidy.
I am realizing that many aren’t as involved with their moms like me; we’ve always hung out a lot.
So maybe the routine was the partner drops her off late in the deep dark night and is on his way without a second thought as many seem to think that not unusual.
It may be they are just not that close or involved in her life or don’t want to start any time consuming habits of assistance.
All imo