Whilst not mathematically out of it, the other thing to bear in mind with Rangers is how much has to happen for them to win the title.
They're not even third yet, first of all, but let's assume they don't lose their game in hand and so go above Hibs. If they were five points behind Celtic at this stage, with Celtic top, very few would be saying they were going to win the title. As it is, they're five points behind Celtic, but twelve (nine at best when game in hand played) behind Hearts.
I don't carry the same optimism about Hearts that some do, but let's be honest, this is not last season's Aberdeen. Any regression to the mean still may be enough for them to win the title if Celtic don't sort themselves out, such is the advantage that Hearts have built up early and the generally decent performances. Rangers need to overcome those deficits on two teams, meaning that they need to be just about perfect from here until the end of their season.
So far, Röhl has done what he did at Wednesday; be pretty consistent in winning the games that they should, but look totally off the pace against sides that are better. Aside from the weird hold we seemed to have on West Brom, he showed no indication of being able to figure out how to beat the better sides. To make up the gap, whilst overtaking three teams, Rangers will need to not only not slip up against the lower teams, but also beat Celtic and Hearts. Probably every time remaining.