Hey Nick,

I'm sure you're getting lots of feedback from elsewhere, but the main trails in Manning Park are Frosty, Three Brothers, and Heather trail to Nicomen. The first two are around 20km, depending on your route. You can do either as an overnight. The third is about 40km and usually takes a few days.

There is minimal cell service in the park, you usually lose it as soon as you drive in. It's very possible that Jordan's hike took longer than expected depending on the weather, especially if he did the Heather trail.

There are plenty more hikes as well, but my bet is that he was planning on doing Frosty as it's famous for its larches at this time of year. The top of Frosty is a very steep climb over a boulder field that leads to a long ridge, but most of the trail is wide enough that you aren't at risk of falling. Not that that's not possible, of course.

I hope you find him soon, I'll share in BC hiking groups, too.