Trial strategy is left to counsel's discretion. One of the most important decisions that the defense will make is what their overall strategy will be to create reasonable doubt. This decision is molded by the facts and circumstances of the alleged crime. Those will dictate what evidence in any particular case will create reasonable doubt and which theories may just plainly be viewed as unreasonable.
Here, the defense can, if it wishes to do so, try to present witnesses who testify about the traffic on CR 225 and may even introduce police reports showing prior accidents near Puma Path, if any exist. The defense may even hire an accident reconstruction expert to testify that it's possible that the bike's location was a product of some sort of collision. The problem is that the state will likely have its own accident reconstruction expert who will testify that it is highly unlikely that the bike would end up where it did as a result of a crash.
I brought up AM's mountain lion statement (mentioned by
@TxGidget) because it would be much more difficult for the State to rebut this account. First -- assuming the witness can be located and subpoenaed -- it will be a sworn officer who would be testifying as to
having seen the mountain lion. Second, if the officer attempts to deny the mountain lion statement, then AM himself could be called to rebut the officer's denial (or -- if stipulated -- the video of the interview could be played for this purpose). Finally -- from a strategic viewpoint -- a jury would essentially be given an out: allowing jurors to "hang their hats" on a non-human cause of harm means that they do not have to assign blame to another human being, something which some people are very uncomfortable with doing.
Now, all this is not to say that the mountain lion theory -- even if buttressed by the testimony of an officer on the scene -- is infallible. I don't no much about mountain lions (here in indiana, there have been only two confirmed sightings within the last 10 years, and DNR believes it may be the same animal), but I would assume they would leave tracks or droppings; it is possible that the state could rebut the theory by having a witness testify that neither tracks nor droppings were found near the Morphew home.
All this
is speculative, of course, but the revelation of the fact that an
officer saw a mountain lion near the morphe home did appear to me to be a game changer in terms of a possible defense.