So.. A couple things;
Pears, when ripe, go soft and basically turn into Pear Sauce once we start to make wine with them. They can also brown/oxidize, from exposure of the flesh of the fruit to oxygen. The campden tablets, added like you did, keep the pears from oxidizing and turning brown. So that step, saved your 'color'. That's a pretty necessary step, for Pear. Someone asked about Ascorbic Acid, which serves the same purpose of keeping the fruit from oxidizing, but doesnt give off the K-meta vapors that would hinder fermentation for ~12 hours.
When it comes to the yeast starter, 5 days is about 4 days too long. The longest that I've left a yeast in starter-form, was for about ~18 hours, but that was to build up a big yeast culture for a rather difficult fermentation. Most yeasts can be started in 4-6 hours, even making a 'Starter'.
They come in a dried form, the yeast, and once they get their feet wet, they begin with the intake of water - similar to a seed, per say - and the water entering the yeast cells begins the 'living' and reproductive systems; so they begin to bud asexually, dividing in half and by doing so, multiplying in numbers. 1 turns to 2, 2 turns to 4, by splitting in half. This begins in the 'yeast starter', continues when we pitch it into the 'must' (wine, before yeast are added and alcohol is made), and through the 'lag phase' (a period of time with little to no signs of fermentation). The end of the 'lag phase', is when the 'cap' forms; the yeast begin to eat the sugars, creating alcohol and CO2 - the CO2 begins to rise, attaching to particulate and carrying those solids to the liquid's surface, forming a cap of solids over the wine.
Hopefully your carboy isnt more than about 2/3-full. If the yeast take off, they'll generate the a small cap - pears dont have many solids, its more sauce like I mentioned - but it'll also begin to foam, and that foam can be generated faster than the airlock/gizmo wants to let it dissipate.
A hydrometer will be pretty essential to seeing this batch through to the end though, and like was previously mentioned, they prefer company - so I have two, myself. Had 3, but..
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