If we consider a carbocation, let's say $\ce{C2H3^+}$
The hypothetical hyperconjugation structures will be like this
In the actual structure(i.e. the resonance hybrid, all the $3$ $\ce{H}$ atoms bonded to the $\ce{SP3}$ hybridised carbon atom will have partial positive charge. The rightmost $\ce{SP2}$ atom has partial positive charge too. I can't understand which one will be more positive? For that I need to know which structure will contribute more to the hybrid.
In the hypothetical and identical structures (b) , (c) and (d) there are 2 different "species" , one resembles an $\ce{H}^+$ ion and other is an alkene, so how can the rules to find which structure is more contributing be applied. (b) , (c) and (d) will have equal contributions but what about (a) ?
