Ask Me Help Desk - Isn't fractional model of quarks electric charge wrong?

According to ahmadreza estakhr model of quarks with integer electric charge, Up-type quarks have no electric charge (0), and only Down-type quarks could have electric charge of minus or plus one(-1 or +1). this is because of weak nuclear interaction between up-type quarks and $W^{\pm}$ . $U^0+W^+\to D^+$ . $U^0+W^-\to D^-$ . only $\Delta{++}$ is not consisted with estakhr's model. his idea is quark content of delta baryon is wrong.ref. http://bit.ly/1flU50Z