Kress,
I have found on IGI two references for Titus Illingworth:
1. Titus Illingworth, born 22 Nov 1800, baptised 26 December 1800.
Father: Benjamin Mother: Martha.
2. Titus Illingworth birth 1801 Manningham. No other information.
Just because marriage records state 'Of this parish' it is no indication that he was born in the parish! He may have moved into the parish before marriage.
I would suggest that the Osset birth is your best bet.
David