Hope you don't mind my responding to your question.
Legally speaking, it doesn't matter who brought the gun. It doesn't matter who shot Tim.
It is something that we would all like to know, but we likely never will.
Regarding the messages, IMO DM and MS are "speaking" cryptically and in some sort of lingo and code. There aren't many criminals who would actually plan a murder, completely detailing it in written word. If that is the expectation of proof, then I doubt we would ever be able to convict a single guilty soul.
Therefore, the jury is left to deduce the most probable meaning of those texts within their complete context, in conjunction with all other evidence ... planning missions, planning "the mission", buying a loaded gun, pictures of each of them holding that gun, both discussing the incinerator/BBQ ... Oh, I could go on and on but won't ... Numerous WSers have already stated these in much better and clearer terms than I can.
The text messages are circumstantial evidence, and are to be given the same weight as direct evidence.
I cannot think of one single innocent reason for the purchase of a loaded gun as well as purchase/setup of the incinerator, which DM and MS together had knowledge of.
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I wish it were made clear in some way, which of their individual text messages they attempted to delete. If someone deleted the picture of fireside sausages for example, I would deduce they felt some guilt about it for some reason. I recall some mention of damning texts recovered from SS? You have to ask, why did they choose those particular texts to remove?