There has been speculation in the past that Sebastian Coe may have blood doped. He suffered a prolonged bout of toxoplasmosis which may be spread through blood transfusions.
Also after 1986 he did not achieve the same results after the IOC banned blood doping.
Alberto Cova after 1986 failed to achieve the same success and he known to have admitted to blood doping.
Steve Cram's form after 1986 also went downhill.
Of course, injuries and aging would have contributed to their decline in form or the rise in competition from African nations after 1986.
Is this speculation justified or just rumours to smear Coe's name?