Lost the growing tip on tomato plant

I was nipping the side shoots off my (six) tomato plants yesterday and I saw that one hadn't got a 'leader' stem - it seems a slug or snail has eaten it off. I've noticed, in the past, that if I don't spot the side shoots in time, they can produce their own set of trusses.

I've left the very top side shoot and I'm wondering if I should leave this shoot to become the main stem or just replace the plant.

Any thoughts? The plants are now a foot tall, 'Sungold'.

Yes, leave the top side shoot.
Tying it to the cane/string, as soon as it is big enough, will help straighten the plant up.


snap!